--- /dev/null
+From 0459430add32ea41f3e2ef9351610e6d33627a6b Mon Sep 17 00:00:00 2001
+From: Sven Eckelmann <sven@narfation.org>
+Date: Sun, 10 May 2026 11:43:20 +0200
+Subject: batman-adv: bla: fix report_work leak on backbone_gw purge
+
+From: Sven Eckelmann <sven@narfation.org>
+
+commit 0459430add32ea41f3e2ef9351610e6d33627a6b upstream.
+
+batadv_bla_purge_backbone_gw() removes stale backbone gateway entries,
+but fails to properly handle their associated report_work:
+
+- If report_work is running, the purge must wait for it to finish before
+ freeing the backbone_gw, otherwise the worker may access freed memory
+ (e.g. bat_priv).
+- If report_work is pending, the purge must cancel it and release the
+ reference held for that pending work item.
+
+The previous implementation called hlist_for_each_entry_safe() inside a
+spin_lock_bh() section, but cancel_work_sync() may sleep and therefore
+cannot be called from within a spinlock-protected region.
+
+Restructure the loop to handle one entry per spinlock critical section:
+acquire the lock, find the next entry to purge, remove it from the hash
+list, then release the lock before calling cancel_work_sync() and
+dropping the hash_entry reference. Repeat until no more entries require
+purging.
+
+Cc: stable@kernel.org
+Fixes: 23721387c409 ("batman-adv: add basic bridge loop avoidance code")
+Reviewed-by: Simon Wunderlich <sw@simonwunderlich.de>
+Signed-off-by: Sven Eckelmann <sven@narfation.org>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ net/batman-adv/bridge_loop_avoidance.c | 60 ++++++++++++++++++++-------------
+ 1 file changed, 38 insertions(+), 22 deletions(-)
+
+--- a/net/batman-adv/bridge_loop_avoidance.c
++++ b/net/batman-adv/bridge_loop_avoidance.c
+@@ -1224,6 +1224,7 @@ static void batadv_bla_purge_backbone_gw
+ struct hlist_head *head;
+ struct batadv_hashtable *hash;
+ spinlock_t *list_lock; /* protects write access to the hash lists */
++ bool purged;
+ int i;
+
+ hash = bat_priv->bla.backbone_hash;
+@@ -1234,30 +1235,45 @@ static void batadv_bla_purge_backbone_gw
+ head = &hash->table[i];
+ list_lock = &hash->list_locks[i];
+
+- spin_lock_bh(list_lock);
+- hlist_for_each_entry_safe(backbone_gw, node_tmp,
+- head, hash_entry) {
+- if (now)
+- goto purge_now;
+- if (!batadv_has_timed_out(backbone_gw->lasttime,
+- BATADV_BLA_BACKBONE_TIMEOUT))
+- continue;
+-
+- batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
+- "%s(): backbone gw %pM timed out\n",
+- __func__, backbone_gw->orig);
++ do {
++ purged = false;
++
++ spin_lock_bh(list_lock);
++ hlist_for_each_entry_safe(backbone_gw, node_tmp,
++ head, hash_entry) {
++ if (now)
++ goto purge_now;
++ if (!batadv_has_timed_out(backbone_gw->lasttime,
++ BATADV_BLA_BACKBONE_TIMEOUT))
++ continue;
++
++ batadv_dbg(BATADV_DBG_BLA, backbone_gw->bat_priv,
++ "%s(): backbone gw %pM timed out\n",
++ __func__, backbone_gw->orig);
+
+ purge_now:
+- /* don't wait for the pending request anymore */
+- if (atomic_read(&backbone_gw->request_sent))
+- atomic_dec(&bat_priv->bla.num_requests);
+-
+- batadv_bla_del_backbone_claims(backbone_gw);
+-
+- hlist_del_rcu(&backbone_gw->hash_entry);
+- batadv_backbone_gw_put(backbone_gw);
+- }
+- spin_unlock_bh(list_lock);
++ purged = true;
++
++ /* don't wait for the pending request anymore */
++ if (atomic_read(&backbone_gw->request_sent))
++ atomic_dec(&bat_priv->bla.num_requests);
++
++ batadv_bla_del_backbone_claims(backbone_gw);
++
++ hlist_del_rcu(&backbone_gw->hash_entry);
++ break;
++ }
++ spin_unlock_bh(list_lock);
++
++ if (purged) {
++ /* reference for pending report_work */
++ if (cancel_work_sync(&backbone_gw->report_work))
++ batadv_backbone_gw_put(backbone_gw);
++
++ /* reference for hash_entry */
++ batadv_backbone_gw_put(backbone_gw);
++ }
++ } while (purged);
+ }
+ }
+
--- /dev/null
+From a340a51ed801eab7bb454150c226323b865263cc Mon Sep 17 00:00:00 2001
+From: Ruijie Li <ruijieli51@gmail.com>
+Date: Thu, 14 May 2026 16:13:25 +0800
+Subject: batman-adv: clear current gateway during teardown
+
+From: Ruijie Li <ruijieli51@gmail.com>
+
+commit a340a51ed801eab7bb454150c226323b865263cc upstream.
+
+batadv_gw_node_free() removes the gateway list entries during mesh teardown,
+but it does not clear the currently selected gateway. This leaves stale
+gateway state behind across cleanup and can break a later mesh recreation.
+
+Clear bat_priv->gw.curr_gw before walking the gateway list so the selected
+gateway reference is dropped as part of teardown.
+
+Fixes: 2265c1410864 ("batman-adv: gateway election code refactoring")
+Cc: stable@kernel.org
+Reported-by: Yuan Tan <yuantan098@gmail.com>
+Reported-by: Yifan Wu <yifanwucs@gmail.com>
+Reported-by: Juefei Pu <tomapufckgml@gmail.com>
+Reported-by: Xin Liu <bird@lzu.edu.cn>
+Signed-off-by: Ruijie Li <ruijieli51@gmail.com>
+Signed-off-by: Zhanpeng Li <lzhanpeng2025@lzu.edu.cn>
+Signed-off-by: Ren Wei <n05ec@lzu.edu.cn>
+Signed-off-by: Sven Eckelmann <sven@narfation.org>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ net/batman-adv/gateway_client.c | 4 ++++
+ 1 file changed, 4 insertions(+)
+
+--- a/net/batman-adv/gateway_client.c
++++ b/net/batman-adv/gateway_client.c
+@@ -479,10 +479,14 @@ void batadv_gw_node_delete(struct batadv
+ */
+ void batadv_gw_node_free(struct batadv_priv *bat_priv)
+ {
++ struct batadv_gw_node *curr_gw;
+ struct batadv_gw_node *gw_node;
+ struct hlist_node *node_tmp;
+
+ spin_lock_bh(&bat_priv->gw.list_lock);
++ curr_gw = rcu_replace_pointer(bat_priv->gw.curr_gw, NULL, true);
++ batadv_gw_node_put(curr_gw);
++
+ hlist_for_each_entry_safe(gw_node, node_tmp,
+ &bat_priv->gw.gateway_list, list) {
+ hlist_del_init_rcu(&gw_node->list);
--- /dev/null
+From 2d8826a2d3657cea66fb0370f9e521575a673871 Mon Sep 17 00:00:00 2001
+From: Sven Eckelmann <sven@narfation.org>
+Date: Wed, 13 May 2026 09:01:34 +0200
+Subject: batman-adv: dat: handle forward allocation error
+
+From: Sven Eckelmann <sven@narfation.org>
+
+commit 2d8826a2d3657cea66fb0370f9e521575a673871 upstream.
+
+batadv_dat_forward_data() calls pskb_copy_for_clone() to duplicate an skb
+for each DHT candidate, but does not check the return value before passing
+it to batadv_send_skb_prepare_unicast_4addr(). That function dereferences
+the skb unconditionally, so a failed allocation triggers a NULL pointer
+dereference.
+
+Skip forwarding to the current DHT candidate on allocation failure.
+
+Cc: stable@kernel.org
+Fixes: 785ea1144182 ("batman-adv: Distributed ARP Table - create DHT helper functions")
+Reported-by: Yuan Tan <yuantan098@gmail.com>
+Reported-by: Yifan Wu <yifanwucs@gmail.com>
+Reported-by: Juefei Pu <tomapufckgml@gmail.com>
+Reported-by: Xin Liu <bird@lzu.edu.cn>
+Reviewed-by: Yuan Tan <yuantan098@gmail.com>
+Signed-off-by: Sven Eckelmann <sven@narfation.org>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ net/batman-adv/distributed-arp-table.c | 3 +++
+ 1 file changed, 3 insertions(+)
+
+--- a/net/batman-adv/distributed-arp-table.c
++++ b/net/batman-adv/distributed-arp-table.c
+@@ -698,6 +698,9 @@ static bool batadv_dat_forward_data(stru
+ goto free_orig;
+
+ tmp_skb = pskb_copy_for_clone(skb, GFP_ATOMIC);
++ if (!tmp_skb)
++ goto free_neigh;
++
+ if (!batadv_send_skb_prepare_unicast_4addr(bat_priv, tmp_skb,
+ cand[i].orig_node,
+ packet_subtype)) {
--- /dev/null
+From 9cd3f16c320bfdadd4509358122368deb56a5741 Mon Sep 17 00:00:00 2001
+From: Ruide Cao <caoruide123@gmail.com>
+Date: Wed, 13 May 2026 11:58:15 +0800
+Subject: batman-adv: fix fragment reassembly length accounting
+
+From: Ruide Cao <caoruide123@gmail.com>
+
+commit 9cd3f16c320bfdadd4509358122368deb56a5741 upstream.
+
+batman-adv keeps a running payload length for queued fragments and uses it
+to validate a fragment chain before reassembly.
+
+That accounting currently allows the accumulated fragment length to be
+truncated during updates. As a result, malformed fragment chains can
+bypass the intended validation and drive reassembly with inconsistent
+length state, leading to a local denial of service.
+
+Fix the accounting by storing the accumulated length in a length-typed
+field and rejecting update overflows before the existing validation logic
+runs.
+
+The fix was verified against the original reproducer and against valid
+fragment reassembly paths.
+
+Fixes: 610bfc6bc99b ("batman-adv: Receive fragmented packets and merge")
+Cc: stable@kernel.org
+Reported-by: Yuan Tan <yuantan098@gmail.com>
+Reported-by: Yifan Wu <yifanwucs@gmail.com>
+Reported-by: Juefei Pu <tomapufckgml@gmail.com>
+Reported-by: Xin Liu <bird@lzu.edu.cn>
+Signed-off-by: Ruide Cao <caoruide123@gmail.com>
+Tested-by: Ren Wei <enjou1224z@gmail.com>
+Signed-off-by: Ren Wei <n05ec@lzu.edu.cn>
+Signed-off-by: Sven Eckelmann <sven@narfation.org>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ net/batman-adv/fragmentation.c | 23 +++++++++++++++++------
+ net/batman-adv/types.h | 2 +-
+ 2 files changed, 18 insertions(+), 7 deletions(-)
+
+--- a/net/batman-adv/fragmentation.c
++++ b/net/batman-adv/fragmentation.c
+@@ -17,6 +17,7 @@
+ #include <linux/lockdep.h>
+ #include <linux/minmax.h>
+ #include <linux/netdevice.h>
++#include <linux/overflow.h>
+ #include <linux/skbuff.h>
+ #include <linux/slab.h>
+ #include <linux/spinlock.h>
+@@ -81,9 +82,9 @@ void batadv_frag_purge_orig(struct batad
+ *
+ * Return: the maximum size of payload that can be fragmented.
+ */
+-static int batadv_frag_size_limit(void)
++static size_t batadv_frag_size_limit(void)
+ {
+- int limit = BATADV_FRAG_MAX_FRAG_SIZE;
++ size_t limit = BATADV_FRAG_MAX_FRAG_SIZE;
+
+ limit -= sizeof(struct batadv_frag_packet);
+ limit *= BATADV_FRAG_MAX_FRAGMENTS;
+@@ -144,7 +145,9 @@ static bool batadv_frag_insert_packet(st
+ struct batadv_frag_packet *frag_packet;
+ u8 bucket;
+ u16 seqno, hdr_size = sizeof(struct batadv_frag_packet);
++ bool overflow = false;
+ bool ret = false;
++ size_t data_len;
+
+ /* Linearize packet to avoid linearizing 16 packets in a row when doing
+ * the later merge. Non-linear merge should be added to remove this
+@@ -154,6 +157,7 @@ static bool batadv_frag_insert_packet(st
+ goto err;
+
+ frag_packet = (struct batadv_frag_packet *)skb->data;
++ data_len = skb->len - hdr_size;
+ seqno = ntohs(frag_packet->seqno);
+ bucket = seqno % BATADV_FRAG_BUFFER_COUNT;
+
+@@ -172,7 +176,7 @@ static bool batadv_frag_insert_packet(st
+ spin_lock_bh(&chain->lock);
+ if (batadv_frag_init_chain(chain, seqno)) {
+ hlist_add_head(&frag_entry_new->list, &chain->fragment_list);
+- chain->size = skb->len - hdr_size;
++ chain->size = data_len;
+ chain->timestamp = jiffies;
+ chain->total_size = ntohs(frag_packet->total_size);
+ ret = true;
+@@ -189,7 +193,11 @@ static bool batadv_frag_insert_packet(st
+ if (frag_entry_curr->no < frag_entry_new->no) {
+ hlist_add_before(&frag_entry_new->list,
+ &frag_entry_curr->list);
+- chain->size += skb->len - hdr_size;
++
++ if (check_add_overflow(chain->size, data_len,
++ &chain->size))
++ overflow = true;
++
+ chain->timestamp = jiffies;
+ ret = true;
+ goto out;
+@@ -202,13 +210,16 @@ static bool batadv_frag_insert_packet(st
+ /* Reached the end of the list, so insert after 'frag_entry_last'. */
+ if (likely(frag_entry_last)) {
+ hlist_add_behind(&frag_entry_new->list, &frag_entry_last->list);
+- chain->size += skb->len - hdr_size;
++
++ if (check_add_overflow(chain->size, data_len, &chain->size))
++ overflow = true;
++
+ chain->timestamp = jiffies;
+ ret = true;
+ }
+
+ out:
+- if (chain->size > batadv_frag_size_limit() ||
++ if (overflow || chain->size > batadv_frag_size_limit() ||
+ chain->total_size != ntohs(frag_packet->total_size) ||
+ chain->total_size > batadv_frag_size_limit()) {
+ /* Clear chain if total size of either the list or the packet
+--- a/net/batman-adv/types.h
++++ b/net/batman-adv/types.h
+@@ -294,7 +294,7 @@ struct batadv_frag_table_entry {
+ u16 seqno;
+
+ /** @size: accumulated size of packets in list */
+- u16 size;
++ size_t size;
+
+ /** @total_size: expected size of the assembled packet */
+ u16 total_size;
--- /dev/null
+From 94f3b133168d1c49895e7cc6afbcf1cc0b354602 Mon Sep 17 00:00:00 2001
+From: Luxiao Xu <rakukuip@gmail.com>
+Date: Mon, 11 May 2026 18:52:09 +0200
+Subject: batman-adv: fix tp_meter counter underflow during shutdown
+
+From: Luxiao Xu <rakukuip@gmail.com>
+
+commit 94f3b133168d1c49895e7cc6afbcf1cc0b354602 upstream.
+
+batadv_tp_sender_shutdown() unconditionally decrements the "sending"
+atomic counter. If multiple paths (e.g. timeout, user cancel, and
+normal finish) call this function, the counter can underflow to -1.
+
+Since the sender logic treats any non-zero value as "still sending",
+a negative value causes the sender kthread to loop indefinitely.
+This leads to a use-after-free when the interface is removed while
+the zombie thread is still active.
+
+Fix this by using atomic_xchg() to ensure the counter only transitions
+from 1 to 0 once.
+
+Fixes: 33a3bb4a3345 ("batman-adv: throughput meter implementation")
+Cc: stable@kernel.org
+Reported-by: Yuan Tan <yuantan098@gmail.com>
+Reported-by: Yifan Wu <yifanwucs@gmail.com>
+Reported-by: Juefei Pu <tomapufckgml@gmail.com>
+Reported-by: Xin Liu <bird@lzu.edu.cn>
+Signed-off-by: Luxiao Xu <rakukuip@gmail.com>
+Signed-off-by: Ren Wei <n05ec@lzu.edu.cn>
+[sven: added missing change in batadv_tp_send]
+Signed-off-by: Sven Eckelmann <sven@narfation.org>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ net/batman-adv/tp_meter.c | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+--- a/net/batman-adv/tp_meter.c
++++ b/net/batman-adv/tp_meter.c
+@@ -435,7 +435,7 @@ static void batadv_tp_sender_end(struct
+ static void batadv_tp_sender_shutdown(struct batadv_tp_vars *tp_vars,
+ enum batadv_tp_meter_reason reason)
+ {
+- if (!atomic_dec_and_test(&tp_vars->sending))
++ if (atomic_xchg(&tp_vars->sending, 0) != 1)
+ return;
+
+ tp_vars->reason = reason;
+@@ -869,7 +869,7 @@ static int batadv_tp_send(void *arg)
+ "Meter: %s() cannot send packets (%d)\n",
+ __func__, err);
+ /* ensure nobody else tries to stop the thread now */
+- if (atomic_dec_and_test(&tp_vars->sending))
++ if (atomic_xchg(&tp_vars->sending, 0) == 1)
+ tp_vars->reason = err;
+ break;
+ }
--- /dev/null
+From bc62216dc8e221e3781afa14430f45208bfa9af9 Mon Sep 17 00:00:00 2001
+From: Sven Eckelmann <sven@narfation.org>
+Date: Wed, 13 May 2026 09:01:36 +0200
+Subject: batman-adv: frag: disallow unicast fragment in fragment
+
+From: Sven Eckelmann <sven@narfation.org>
+
+commit bc62216dc8e221e3781afa14430f45208bfa9af9 upstream.
+
+batadv_frag_skb_buffer() is called by batadv_batman_skb_recv() when a
+BATADV_UNICAST_FRAG packet is received. Once all fragments are collected
+and the packet is reassembled, batadv_recv_frag_packet() calls
+batadv_batman_skb_recv() again to process the defragmented payload.
+
+A malicious sender can craft a BATADV_UNICAST_FRAG packet whose reassembled
+payload is itself a BATADV_UNICAST_FRAG packet (matryoshka-style nesting).
+Each nesting level recurses through batadv_batman_skb_recv() without bound,
+growing the kernel stack until it is exhausted.
+
+Since refragmentation or fragments in fragments are not actually allowed,
+discard all packets which are still BATADV_UNICAST_FRAG packets after the
+defragmentation process.
+
+Cc: stable@kernel.org
+Fixes: 610bfc6bc99b ("batman-adv: Receive fragmented packets and merge")
+Reported-by: Yuan Tan <yuantan098@gmail.com>
+Reported-by: Yifan Wu <yifanwucs@gmail.com>
+Reported-by: Juefei Pu <tomapufckgml@gmail.com>
+Reported-by: Xin Liu <bird@lzu.edu.cn>
+Reviewed-by: Yuan Tan <yuantan098@gmail.com>
+Signed-off-by: Sven Eckelmann <sven@narfation.org>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ net/batman-adv/fragmentation.c | 35 +++++++++++++++++++++++++++++++++++
+ 1 file changed, 35 insertions(+)
+
+--- a/net/batman-adv/fragmentation.c
++++ b/net/batman-adv/fragmentation.c
+@@ -306,6 +306,31 @@ free:
+ }
+
+ /**
++ * batadv_skb_is_frag() - check if newly merged skb is gain a unicast packet
++ * @skb: newly merged skb
++ *
++ * Return: if newly skb is of type BATADV_UNICAST_FRAG
++ */
++static bool batadv_skb_is_frag(struct sk_buff *skb)
++{
++ struct batadv_ogm_packet *batadv_ogm_packet;
++
++ /* packet should hold at least type and version */
++ if (unlikely(!pskb_may_pull(skb, 2)))
++ return false;
++
++ batadv_ogm_packet = (struct batadv_ogm_packet *)skb->data;
++
++ if (batadv_ogm_packet->version != BATADV_COMPAT_VERSION)
++ return false;
++
++ if (batadv_ogm_packet->packet_type != BATADV_UNICAST_FRAG)
++ return false;
++
++ return true;
++}
++
++/**
+ * batadv_frag_skb_buffer() - buffer fragment for later merge
+ * @skb: skb to buffer
+ * @orig_node_src: originator that the skb is received from
+@@ -338,6 +363,16 @@ bool batadv_frag_skb_buffer(struct sk_bu
+ if (!skb_out)
+ goto out_err;
+
++ /* fragment in fragment is not allowed. otherwise it is possible
++ * to exhaust the stack when receiving a matryoshka-style
++ * "fragments in a fragment packet"
++ */
++ if (batadv_skb_is_frag(skb_out)) {
++ kfree_skb(skb_out);
++ skb_out = NULL;
++ goto out_err;
++ }
++
+ out:
+ ret = true;
+ out_err:
--- /dev/null
+From 20c2d6a20ca936f5aaa6dd40f73f262ac45c87cc Mon Sep 17 00:00:00 2001
+From: Sven Eckelmann <sven@narfation.org>
+Date: Thu, 14 May 2026 19:22:02 +0200
+Subject: batman-adv: mcast: fix use-after-free in orig_node RCU release
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+From: Sven Eckelmann <sven@narfation.org>
+
+commit 20c2d6a20ca936f5aaa6dd40f73f262ac45c87cc upstream.
+
+batadv_mcast_purge_orig() removes entries from RCU-protected hlists but
+does not wait for an RCU grace period before returning. Concurrent RCU
+readers may still accesses references to those entries at the point of
+removal. RCU-protected readers trying to operate on entries like
+orig->mcast_want_all_ipv6_node will then access already freed memory.
+
+Fix this by moving batadv_mcast_purge_orig() to batadv_orig_node_release(),
+just before the call_rcu() invocation. This ensures RCU readers that were
+active at purge time have drained before the orig_node memory is reclaimed.
+
+Cc: stable@kernel.org
+Fixes: ab49886e3da7 ("batman-adv: Add IPv4 link-local/IPv6-ll-all-nodes multicast support")
+Acked-by: Linus Lüssing <linus.luessing@c0d3.blue>
+Signed-off-by: Sven Eckelmann <sven@narfation.org>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ net/batman-adv/originator.c | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+--- a/net/batman-adv/originator.c
++++ b/net/batman-adv/originator.c
+@@ -823,8 +823,6 @@ static void batadv_orig_node_free_rcu(st
+
+ orig_node = container_of(rcu, struct batadv_orig_node, rcu);
+
+- batadv_mcast_purge_orig(orig_node);
+-
+ batadv_frag_purge_orig(orig_node, NULL);
+
+ kfree(orig_node->tt_buff);
+@@ -878,6 +876,8 @@ void batadv_orig_node_release(struct kre
+ /* Free nc_nodes */
+ batadv_nc_purge_orig(orig_node->bat_priv, orig_node, NULL);
+
++ batadv_mcast_purge_orig(orig_node);
++
+ call_rcu(&orig_node->rcu, batadv_orig_node_free_rcu);
+ }
+
--- /dev/null
+From 6c65cf23d4c6170fcf5714c32aa64689718cb142 Mon Sep 17 00:00:00 2001
+From: Sven Eckelmann <sven@narfation.org>
+Date: Wed, 13 May 2026 09:01:35 +0200
+Subject: batman-adv: tp_meter: avoid use of uninit sender vars
+
+From: Sven Eckelmann <sven@narfation.org>
+
+commit 6c65cf23d4c6170fcf5714c32aa64689718cb142 upstream.
+
+batadv_tp_recv_ack() and batadv_tp_stop() are only valid for tp_vars in the
+BATADV_TP_SENDER role. When called with a BATADV_TP_RECEIVER role, it
+proceeds to read sender-only members that were never initialized, leading
+to undefined behavior.
+
+This can be triggered when a node that is currently acting as a receiver in
+an ongoing tp_meter session receives a malicious ACK packet.
+
+Guard against this by checking tp_vars->role immediately after the
+lookup and bailing out if it is not BATADV_TP_SENDER, before any of
+those members are accessed.
+
+Cc: stable@kernel.org
+Fixes: 33a3bb4a3345 ("batman-adv: throughput meter implementation")
+Reported-by: Yuan Tan <yuantan098@gmail.com>
+Reported-by: Yifan Wu <yifanwucs@gmail.com>
+Reported-by: Juefei Pu <tomapufckgml@gmail.com>
+Reported-by: Xin Liu <bird@lzu.edu.cn>
+Reviewed-by: Yuan Tan <yuantan098@gmail.com>
+Signed-off-by: Sven Eckelmann <sven@narfation.org>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ net/batman-adv/tp_meter.c | 11 +++++++++--
+ 1 file changed, 9 insertions(+), 2 deletions(-)
+
+--- a/net/batman-adv/tp_meter.c
++++ b/net/batman-adv/tp_meter.c
+@@ -647,6 +647,9 @@ static void batadv_tp_recv_ack(struct ba
+ if (unlikely(!tp_vars))
+ return;
+
++ if (unlikely(tp_vars->role != BATADV_TP_SENDER))
++ goto out;
++
+ if (unlikely(atomic_read(&tp_vars->sending) == 0))
+ goto out;
+
+@@ -1080,12 +1083,16 @@ void batadv_tp_stop(struct batadv_priv *
+ if (!tp_vars) {
+ batadv_dbg(BATADV_DBG_TP_METER, bat_priv,
+ "Meter: trying to interrupt an already over connection\n");
+- goto out;
++ goto out_put_orig_node;
+ }
+
++ if (unlikely(tp_vars->role != BATADV_TP_SENDER))
++ goto out_put_tp_vars;
++
+ batadv_tp_sender_shutdown(tp_vars, return_value);
++out_put_tp_vars:
+ batadv_tp_vars_put(tp_vars);
+-out:
++out_put_orig_node:
+ batadv_orig_node_put(orig_node);
+ }
+
--- /dev/null
+From fc92cdfcb295cefa4344d71a527d61b638b7bfc4 Mon Sep 17 00:00:00 2001
+From: Sven Eckelmann <sven@narfation.org>
+Date: Sat, 2 May 2026 19:53:21 +0200
+Subject: batman-adv: tt: fix negative last_changeset_len
+
+From: Sven Eckelmann <sven@narfation.org>
+
+commit fc92cdfcb295cefa4344d71a527d61b638b7bfc4 upstream.
+
+batadv_piv_tt::last_changeset_len len was declared as s16, but the field is
+never intended to hold a negative value. When a value greater than 32767 is
+assigned, it wraps to a negative signed integer.
+
+In batadv_send_my_tt_response(), last_changeset_len is temporarily widened
+to s32. The incorrectly negative s16 value propagates into the s32, causing
+batadv_tt_prepare_tvlv_local_data() to allocate a full sized buffer but
+populates only a small portion of it with the collected changeset. All
+remaining bits are kept uninitialized.
+
+Using an u16 avoids this type confusion and ensures that no (negative) sign
+extension is performed in batadv_send_my_tt_response().
+
+Cc: stable@kernel.org
+Fixes: a73105b8d4c7 ("batman-adv: improved client announcement mechanism")
+Signed-off-by: Sven Eckelmann <sven@narfation.org>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ net/batman-adv/types.h | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+--- a/net/batman-adv/types.h
++++ b/net/batman-adv/types.h
+@@ -993,7 +993,7 @@ struct batadv_priv_tt {
+ * @last_changeset_len: length of last tt changeset this host has
+ * generated
+ */
+- s16 last_changeset_len;
++ u16 last_changeset_len;
+
+ /**
+ * @last_changeset_lock: lock protecting last_changeset &
--- /dev/null
+From b64963a2ceeb7529310b6cf253a1e540784422f4 Mon Sep 17 00:00:00 2001
+From: Sven Eckelmann <sven@narfation.org>
+Date: Sat, 2 May 2026 19:53:21 +0200
+Subject: batman-adv: tt: fix negative tt_buff_len
+
+From: Sven Eckelmann <sven@narfation.org>
+
+commit b64963a2ceeb7529310b6cf253a1e540784422f4 upstream.
+
+batadv_orig_node::tt_buff_len was declared as s16, but the field is never
+intended to hold a negative value. When a value greater than 32767 is
+assigned, it wraps to a negative signed integer.
+
+In batadv_send_other_tt_response(), tt_buff_len is temporarily widened to
+s32. The incorrectly negative s16 value propagates into the s32, causing
+batadv_tt_prepare_tvlv_global_data() to allocate a full sized buffer but
+populates only a small portion of it with the collected changeset. All
+remaining bits are kept uninitialized.
+
+Using an u16 avoids this type confusion and ensures that no (negative) sign
+extension is performed in batadv_send_other_tt_response().
+
+Cc: stable@kernel.org
+Fixes: a73105b8d4c7 ("batman-adv: improved client announcement mechanism")
+Signed-off-by: Sven Eckelmann <sven@narfation.org>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ net/batman-adv/types.h | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+--- a/net/batman-adv/types.h
++++ b/net/batman-adv/types.h
+@@ -445,7 +445,7 @@ struct batadv_orig_node {
+ * @tt_buff_len: length of the last tt changeset this node received
+ * from the orig node
+ */
+- s16 tt_buff_len;
++ u16 tt_buff_len;
+
+ /** @tt_buff_lock: lock that protects tt_buff and tt_buff_len */
+ spinlock_t tt_buff_lock;
--- /dev/null
+From c68337442f03953237a94577beb468ab2662a851 Mon Sep 17 00:00:00 2001
+From: Zhihao Cheng <chengzhihao1@huawei.com>
+Date: Tue, 19 May 2026 17:18:05 +0800
+Subject: cifs: Fix busy dentry used after unmounting
+
+From: Zhihao Cheng <chengzhihao1@huawei.com>
+
+commit c68337442f03953237a94577beb468ab2662a851 upstream.
+
+Since commit 340cea84f691c ("cifs: open files should not hold ref on
+superblock"), cifs file only holds the dentry ref_cnt, the cifs file
+close work(cfile->deferred) could be executed after unmounting, which
+will trigger a warning in generic_shutdown_super:
+ BUG: Dentry 00000000a14a6845{i=c,n=file} still in use (1) [unmount of
+ cifs cifs]
+
+The detailed processs is:
+ process A process B kworker
+ fd = open(PATH)
+ vfs_open
+ file->__f_path = *path // dentry->d_lockref.count = 1
+ cifs_open
+ cifs_new_fileinfo
+ cfile->dentry = dget(dentry) // dentry->d_lockref.count = 2
+ close(fd)
+ __fput
+ cifs_close
+ queue_delayed_work(deferredclose_wq, cfile->deferred)
+ dput(dentry) // dentry->d_lockref.count = 1
+ smb2_deferred_work_close
+ _cifsFileInfo_put
+ list_del(&cifs_file->flist)
+ umount
+ cleanup_mnt
+ deactivate_super
+ cifs_kill_sb
+ cifs_close_all_deferred_files_sb
+ cifs_close_all_deferred_files
+ // cannot find cfile, skip _cifsFileInfo_put
+ kill_anon_super
+ generic_shutdown_super
+ shrink_dcache_for_umount
+ umount_check
+ WARN ! // dentry->d_lockref.count = 1
+ cifsFileInfo_put_final
+ dput(cifs_file->dentry)
+ // dentry->d_lockref.count = 0
+
+Fix it by flushing 'deferredclose_wq' before calling kill_anon_super.
+
+Fetch a reproducer in https://bugzilla.kernel.org/show_bug.cgi?id=221548.
+
+Fixes: 340cea84f691c ("cifs: open files should not hold ref on superblock")
+Cc: stable@vger.kernel.org
+Reviewed-by: Shyam Prasad N <sprasad@microsoft.com>
+Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
+Signed-off-by: Steve French <stfrench@microsoft.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ fs/smb/client/cifsfs.c | 2 ++
+ 1 file changed, 2 insertions(+)
+
+--- a/fs/smb/client/cifsfs.c
++++ b/fs/smb/client/cifsfs.c
+@@ -296,6 +296,8 @@ static void cifs_kill_sb(struct super_bl
+
+ /* Wait for all pending oplock breaks to complete */
+ flush_workqueue(cifsoplockd_wq);
++ /* Wait for all opened files to release */
++ flush_workqueue(deferredclose_wq);
+
+ /* finally release root dentry */
+ dput(cifs_sb->root);
--- /dev/null
+From 215c90ee656114f5e8c32408228d97082f8e0eef Mon Sep 17 00:00:00 2001
+From: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
+Date: Wed, 6 May 2026 13:57:00 +0200
+Subject: device property: set fwnode->secondary to NULL in fwnode_init()
+
+From: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
+
+commit 215c90ee656114f5e8c32408228d97082f8e0eef upstream.
+
+If a firmware node is allocated on the stack (for instance: temporary
+software node whose life-time we control) or on the heap - but using a
+non-zeroing allocation function - and initialized using fwnode_init(),
+its secondary pointer will contain uninitalized memory which likely will
+be neither NULL nor IS_ERR() and so may end up being dereferenced (for
+example: in dev_to_swnode()). Set fwnode->secondary to NULL on
+initialization.
+
+Cc: stable <stable@kernel.org>
+Fixes: 01bb86b380a3 ("driver core: Add fwnode_init()")
+Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
+Reviewed-by: Rafael J. Wysocki (Intel) <rafael@kernel.org>
+Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
+Reviewed-by: Sakari Ailus <sakari.ailus@linux.intel.com>
+Link: https://patch.msgid.link/20260506115701.23035-1-bartosz.golaszewski@oss.qualcomm.com
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ include/linux/fwnode.h | 1 +
+ 1 file changed, 1 insertion(+)
+
+--- a/include/linux/fwnode.h
++++ b/include/linux/fwnode.h
+@@ -193,6 +193,7 @@ struct fwnode_operations {
+ static inline void fwnode_init(struct fwnode_handle *fwnode,
+ const struct fwnode_operations *ops)
+ {
++ fwnode->secondary = NULL;
+ fwnode->ops = ops;
+ INIT_LIST_HEAD(&fwnode->consumers);
+ INIT_LIST_HEAD(&fwnode->suppliers);
--- /dev/null
+From cd86529ec61474a38c3837fb7823790a7c3f8cce Mon Sep 17 00:00:00 2001
+From: Harry Wentland <harry.wentland@amd.com>
+Date: Mon, 4 May 2026 11:14:45 -0400
+Subject: drm/amd/display: Fix integer overflow in bios_get_image()
+
+From: Harry Wentland <harry.wentland@amd.com>
+
+commit cd86529ec61474a38c3837fb7823790a7c3f8cce upstream.
+
+[Why&How]
+The bounds check in bios_get_image() computes 'offset + size' using
+unsigned 32-bit arithmetic before comparing against bios_size. If a
+VBIOS image contains a near-UINT32_MAX offset the addition wraps to a
+small value, the comparison passes, and the function returns a wild
+pointer past the VBIOS mapping.
+
+Additionally, the comparison uses '<' (strict), which incorrectly
+rejects the valid exact-fit case where offset + size == bios_size.
+
+Fix both issues by restructuring the check to avoid the addition
+entirely: first reject if offset alone exceeds bios_size, then check
+size against the remaining space (bios_size - offset). This eliminates
+the overflow and correctly permits exact-fit accesses.
+
+Assisted-by: GitHub Copilot:claude-opus-4.6
+Reviewed-by: Alex Hung <alex.hung@amd.com>
+Signed-off-by: Harry Wentland <harry.wentland@amd.com>
+Signed-off-by: Ivan Lipski <ivan.lipski@amd.com>
+Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
+Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
+(cherry picked from commit d40fb392af659c4a02b560319f226842f6ec1a95)
+Cc: stable@vger.kernel.org
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/gpu/drm/amd/display/dc/bios/bios_parser_helper.c | 9 ++++++---
+ 1 file changed, 6 insertions(+), 3 deletions(-)
+
+--- a/drivers/gpu/drm/amd/display/dc/bios/bios_parser_helper.c
++++ b/drivers/gpu/drm/amd/display/dc/bios/bios_parser_helper.c
+@@ -37,10 +37,13 @@ uint8_t *bios_get_image(struct dc_bios *
+ uint32_t offset,
+ uint32_t size)
+ {
+- if (bp->bios && offset + size < bp->bios_size)
+- return bp->bios + offset;
+- else
++ if (!bp->bios)
+ return NULL;
++
++ if (offset > bp->bios_size || size > bp->bios_size - offset)
++ return NULL;
++
++ return bp->bios + offset;
+ }
+
+ #include "reg_helper.h"
--- /dev/null
+From 86d2b20644b11d21fe52c596e6e922b4590a3e3f Mon Sep 17 00:00:00 2001
+From: Harry Wentland <harry.wentland@amd.com>
+Date: Mon, 4 May 2026 16:14:11 -0400
+Subject: drm/amd/display: Validate GPIO pin LUT table size before iterating
+
+From: Harry Wentland <harry.wentland@amd.com>
+
+commit 86d2b20644b11d21fe52c596e6e922b4590a3e3f upstream.
+
+[Why&How]
+The GPIO pin table parsers in get_gpio_i2c_info() and
+bios_parser_get_gpio_pin_info() derive an element count from the VBIOS
+table_header.structuresize field, then iterate over gpio_pin[] entries.
+However, GET_IMAGE() only validates that the table header itself fits
+within the BIOS image. If the VBIOS reports a structuresize larger than
+the actual mapped data, the loop reads past the end of the BIOS image,
+causing an out-of-bounds read.
+
+Fix this by calling bios_get_image() to validate that the full claimed
+structuresize is accessible within the BIOS image before entering the
+loop in both functions.
+
+Assisted-by: GitHub Copilot:claude-opus-4-6
+Reviewed-by: Alex Hung <alex.hung@amd.com>
+Signed-off-by: Harry Wentland <harry.wentland@amd.com>
+Signed-off-by: Ivan Lipski <ivan.lipski@amd.com>
+Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
+Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
+(cherry picked from commit ba5e95b43b773ae1bf1f66ee6b31eb774e65afe3)
+Cc: stable@vger.kernel.org
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/gpu/drm/amd/display/dc/bios/bios_parser2.c | 9 +++++++++
+ 1 file changed, 9 insertions(+)
+
+--- a/drivers/gpu/drm/amd/display/dc/bios/bios_parser2.c
++++ b/drivers/gpu/drm/amd/display/dc/bios/bios_parser2.c
+@@ -490,6 +490,10 @@ static enum bp_result get_gpio_i2c_info(
+ - sizeof(struct atom_common_table_header))
+ / sizeof(struct atom_gpio_pin_assignment);
+
++ if (!bios_get_image(&bp->base, DATA_TABLES(gpio_pin_lut),
++ le16_to_cpu(header->table_header.structuresize)))
++ return BP_RESULT_BADBIOSTABLE;
++
+ pin = (struct atom_gpio_pin_assignment *) header->gpio_pin;
+
+ for (table_index = 0; table_index < count; table_index++) {
+@@ -680,6 +684,11 @@ static enum bp_result bios_parser_get_gp
+ count = (le16_to_cpu(header->table_header.structuresize)
+ - sizeof(struct atom_common_table_header))
+ / sizeof(struct atom_gpio_pin_assignment);
++
++ if (!bios_get_image(&bp->base, DATA_TABLES(gpio_pin_lut),
++ le16_to_cpu(header->table_header.structuresize)))
++ return BP_RESULT_BADBIOSTABLE;
++
+ for (i = 0; i < count; ++i) {
+ if (header->gpio_pin[i].gpio_id != gpio_id)
+ continue;
--- /dev/null
+From 6c92f6d9600efa3ef0d9e560a2b52776d9803c29 Mon Sep 17 00:00:00 2001
+From: Harry Wentland <harry.wentland@amd.com>
+Date: Thu, 7 May 2026 16:26:31 -0400
+Subject: drm/amd/display: Validate payload length and link_index in dc_process_dmub_aux_transfer_async
+
+From: Harry Wentland <harry.wentland@amd.com>
+
+commit 6c92f6d9600efa3ef0d9e560a2b52776d9803c29 upstream.
+
+[Why&How]
+dc_process_dmub_aux_transfer_async() copies payload->length bytes into a
+16-byte stack buffer (dpaux.data[16]) guarded only by an ASSERT(), which
+is a no-op in release builds. If a caller ever passes length > 16 this
+results in a stack buffer overflow via memcpy.
+
+Additionally, link_index is used to dereference dc->links[] without
+bounds checking against dc->link_count, risking an out-of-bounds access.
+
+Replace the ASSERT with a hard runtime check that returns false when
+payload->length exceeds the destination buffer size, and add a bounds
+check for link_index before it is used.
+
+Assisted-by: GitHub Copilot:Claude claude-4-opus
+Reviewed-by: Alex Hung <alex.hung@amd.com>
+Signed-off-by: Harry Wentland <harry.wentland@amd.com>
+Signed-off-by: Ivan Lipski <ivan.lipski@amd.com>
+Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
+Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
+(cherry picked from commit ba4caa9fecdf7a38f98c878ad05a8a64148b6881)
+Cc: stable@vger.kernel.org
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/gpu/drm/amd/display/dc/core/dc.c | 6 +++++-
+ 1 file changed, 5 insertions(+), 1 deletion(-)
+
+--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
++++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
+@@ -4737,7 +4737,11 @@ bool dc_process_dmub_aux_transfer_async(
+ union dmub_rb_cmd cmd = {0};
+ struct dc_dmub_srv *dmub_srv = dc->ctx->dmub_srv;
+
+- ASSERT(payload->length <= 16);
++ if (link_index >= dc->link_count || !dc->links[link_index])
++ return false;
++
++ if (payload->length > sizeof(cmd.dp_aux_access.aux_control.dpaux.data))
++ return false;
+
+ cmd.dp_aux_access.header.type = DMUB_CMD__DP_AUX_ACCESS;
+ cmd.dp_aux_access.header.payload_bytes = 0;
--- /dev/null
+From 73d01051e8040c0b1de7fd26b3b8d0c2ffa6895c Mon Sep 17 00:00:00 2001
+From: Osama Abdelkader <osama.abdelkader@gmail.com>
+Date: Thu, 30 Apr 2026 21:49:42 +0200
+Subject: drm/bridge: chipone-icn6211: use devm_drm_bridge_add in i2c probe
+
+From: Osama Abdelkader <osama.abdelkader@gmail.com>
+
+commit 73d01051e8040c0b1de7fd26b3b8d0c2ffa6895c upstream.
+
+Use devm_drm_bridge_add() so the bridge is released if probe
+fails after registration, and drop drm_bridge_remove() in chipone_i2c_probe.
+
+Signed-off-by: Osama Abdelkader <osama.abdelkader@gmail.com>
+Fixes: 8dde6f7452a1 ("drm: bridge: icn6211: Add I2C configuration support")
+Cc: stable@vger.kernel.org
+Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
+Link: https://patch.msgid.link/20260430194944.78119-1-osama.abdelkader@gmail.com
+Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/gpu/drm/bridge/chipone-icn6211.c | 4 +++-
+ 1 file changed, 3 insertions(+), 1 deletion(-)
+
+--- a/drivers/gpu/drm/bridge/chipone-icn6211.c
++++ b/drivers/gpu/drm/bridge/chipone-icn6211.c
+@@ -758,7 +758,9 @@ static int chipone_i2c_probe(struct i2c_
+ dev_set_drvdata(dev, icn);
+ i2c_set_clientdata(client, icn);
+
+- drm_bridge_add(&icn->bridge);
++ ret = devm_drm_bridge_add(dev, &icn->bridge);
++ if (ret)
++ return ret;
+
+ return chipone_dsi_host_attach(icn);
+ }
--- /dev/null
+From e02b5262fd288cc235f14e12233ea54e78c04611 Mon Sep 17 00:00:00 2001
+From: Julien Chauveau <chauveau.julien@gmail.com>
+Date: Tue, 24 Mar 2026 20:30:11 +0100
+Subject: drm/bridge: it66121: acquire reset GPIO in probe
+
+From: Julien Chauveau <chauveau.julien@gmail.com>
+
+commit e02b5262fd288cc235f14e12233ea54e78c04611 upstream.
+
+The it66121_ctx structure has a gpio_reset field, and it66121_hw_reset()
+calls gpiod_set_value() on it. However, the GPIO descriptor is never
+acquired via devm_gpiod_get(), leaving gpio_reset as NULL throughout
+the driver lifetime.
+
+gpiod_set_value() silently returns when passed a NULL descriptor, so
+the hardware reset sequence in it66121_hw_reset() is a no-op. This
+leaves the chip in an undefined state at probe time, which can prevent
+it from responding on the I2C bus.
+
+The DT binding marks reset-gpios as a required property, so all
+compliant device trees provide this GPIO. Add the missing
+devm_gpiod_get() call after enabling power supplies and before the
+hardware reset, so the chip is properly reset with power applied.
+
+Fixes: 988156dc2fc9 ("drm: bridge: add it66121 driver")
+Cc: stable@vger.kernel.org
+Signed-off-by: Julien Chauveau <chauveau.julien@gmail.com>
+Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
+Tested-by: Javier Martinez Canillas <javierm@redhat.com>
+Link: https://patch.msgid.link/20260324193011.16583-1-chauveau.julien@gmail.com
+Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/gpu/drm/bridge/ite-it66121.c | 5 +++++
+ 1 file changed, 5 insertions(+)
+
+--- a/drivers/gpu/drm/bridge/ite-it66121.c
++++ b/drivers/gpu/drm/bridge/ite-it66121.c
+@@ -1582,6 +1582,11 @@ static int it66121_probe(struct i2c_clie
+ if (ret)
+ return ret;
+
++ ctx->gpio_reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
++ if (IS_ERR(ctx->gpio_reset))
++ return dev_err_probe(dev, PTR_ERR(ctx->gpio_reset),
++ "Failed to get reset GPIO\n");
++
+ it66121_hw_reset(ctx);
+
+ ctx->regmap = devm_regmap_init_i2c(client, &it66121_regmap_config);
--- /dev/null
+From d45d5c819f2cd0b6b5d76a194a537a5f4aeefecb Mon Sep 17 00:00:00 2001
+From: Osama Abdelkader <osama.abdelkader@gmail.com>
+Date: Thu, 30 Apr 2026 21:56:59 +0200
+Subject: drm/bridge: megachips: remove bridge when irq request fails
+
+From: Osama Abdelkader <osama.abdelkader@gmail.com>
+
+commit d45d5c819f2cd0b6b5d76a194a537a5f4aeefecb upstream.
+
+If devm_request_threaded_irq() fails after drm_bridge_add(), remove the
+bridge before returning.
+
+Keep drm_bridge_add() rather than devm_drm_bridge_add(): registration is
+tied to the STDP4028 device while ge_b850v3_register() may complete from
+either I2C probe; devm would not unwind the bridge if the other client's
+probe fails.
+
+Signed-off-by: Osama Abdelkader <osama.abdelkader@gmail.com>
+Fixes: fcfa0ddc18ed ("drm/bridge: Drivers for megachips-stdpxxxx-ge-b850v3-fw (LVDS-DP++)")
+Cc: stable@vger.kernel.org
+Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
+Tested-by: Ian Ray <ian.ray@gehealthcare.com>
+Link: https://patch.msgid.link/20260430195700.80317-1-osama.abdelkader@gmail.com
+Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/gpu/drm/bridge/megachips-stdpxxxx-ge-b850v3-fw.c | 16 +++++++++------
+ 1 file changed, 10 insertions(+), 6 deletions(-)
+
+--- a/drivers/gpu/drm/bridge/megachips-stdpxxxx-ge-b850v3-fw.c
++++ b/drivers/gpu/drm/bridge/megachips-stdpxxxx-ge-b850v3-fw.c
+@@ -302,7 +302,6 @@ static void ge_b850v3_lvds_remove(void)
+ goto out;
+
+ drm_bridge_remove(&ge_b850v3_lvds_ptr->bridge);
+-
+ ge_b850v3_lvds_ptr = NULL;
+ out:
+ mutex_unlock(&ge_b850v3_lvds_dev_mutex);
+@@ -312,6 +311,7 @@ static int ge_b850v3_register(void)
+ {
+ struct i2c_client *stdp4028_i2c = ge_b850v3_lvds_ptr->stdp4028_i2c;
+ struct device *dev = &stdp4028_i2c->dev;
++ int ret;
+
+ /* drm bridge initialization */
+ ge_b850v3_lvds_ptr->bridge.funcs = &ge_b850v3_lvds_funcs;
+@@ -329,11 +329,15 @@ static int ge_b850v3_register(void)
+ if (!stdp4028_i2c->irq)
+ return 0;
+
+- return devm_request_threaded_irq(&stdp4028_i2c->dev,
+- stdp4028_i2c->irq, NULL,
+- ge_b850v3_lvds_irq_handler,
+- IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
+- "ge-b850v3-lvds-dp", ge_b850v3_lvds_ptr);
++ ret = devm_request_threaded_irq(&stdp4028_i2c->dev,
++ stdp4028_i2c->irq, NULL,
++ ge_b850v3_lvds_irq_handler,
++ IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
++ "ge-b850v3-lvds-dp", ge_b850v3_lvds_ptr);
++ if (ret)
++ drm_bridge_remove(&ge_b850v3_lvds_ptr->bridge);
++
++ return ret;
+ }
+
+ static int stdp4028_ge_b850v3_fw_probe(struct i2c_client *stdp4028_i2c,
--- /dev/null
+From 9af1b6e175c82daf4b423da339a722d8e67a735a Mon Sep 17 00:00:00 2001
+From: Deepanshu Kartikey <kartikey406@gmail.com>
+Date: Tue, 19 May 2026 13:52:47 +0530
+Subject: drm/virtio: use uninterruptible resv lock for plane updates
+
+From: Deepanshu Kartikey <kartikey406@gmail.com>
+
+commit 9af1b6e175c82daf4b423da339a722d8e67a735a upstream.
+
+virtio_gpu_cursor_plane_update() and virtio_gpu_resource_flush() lock
+the framebuffer BO's dma_resv via virtio_gpu_array_lock_resv() and
+ignore its return value. The function can fail with -EINTR from
+dma_resv_lock_interruptible() (signal during lock wait) or with
+-ENOMEM from dma_resv_reserve_fences() (fence slot allocation),
+leaving the resv lock not held. The queue path then walks the object
+array and calls dma_resv_add_fence(), which requires the lock held;
+with lockdep enabled this trips dma_resv_assert_held():
+
+ WARNING: drivers/dma-buf/dma-resv.c:296 at dma_resv_add_fence+0x71e/0x840
+ Call Trace:
+ virtio_gpu_array_add_fence
+ virtio_gpu_queue_ctrl_sgs
+ virtio_gpu_queue_fenced_ctrl_buffer
+ virtio_gpu_cursor_plane_update
+ drm_atomic_helper_commit_planes
+ drm_atomic_helper_commit_tail
+ commit_tail
+ drm_atomic_helper_commit
+ drm_atomic_commit
+ drm_atomic_helper_update_plane
+ __setplane_atomic
+ drm_mode_cursor_universal
+ drm_mode_cursor_common
+ drm_mode_cursor_ioctl
+ drm_ioctl
+ __x64_sys_ioctl
+
+Beyond the WARN, mutating the dma_resv fence list without the lock
+races with concurrent readers/writers and can corrupt the list.
+
+Both call sites run inside the .atomic_update plane callback, which
+DRM atomic helpers do not allow to fail (by the time it runs, the
+commit has been signed off to userspace and there is no clean
+rollback path). Moving the lock acquisition to .prepare_fb was
+rejected because the broader lock scope deadlocks against other BO
+locking paths in the same atomic commit.
+
+Introduce virtio_gpu_lock_one_resv_uninterruptible() that uses
+dma_resv_lock() instead of dma_resv_lock_interruptible(). This
+eliminates the -EINTR failure mode -- the realistic syzbot trigger
+-- without extending the lock hold across the commit. The helper
+locks a single BO and rejects nents > 1 with -EINVAL; both fix
+sites lock exactly one BO.
+
+Use it from virtio_gpu_cursor_plane_update() and
+virtio_gpu_resource_flush(); check the return value to handle the
+remaining -ENOMEM case from dma_resv_reserve_fences() by freeing
+the objs and skipping the plane update for that frame. The
+framebuffer BOs touched here are not shared with other contexts
+and lock contention is expected to be brief, so the loss of
+signal-interruptibility is acceptable.
+
+Other callers of virtio_gpu_array_lock_resv() (the ioctl paths)
+continue to use the interruptible variant.
+
+The bug was reported by syzbot, triggered via fault injection
+(fail_nth) on the DRM_IOCTL_MODE_CURSOR path, which forces the
+-ENOMEM branch in dma_resv_reserve_fences().
+
+Reported-by: syzbot+72bd3dd3a5d5f39a0271@syzkaller.appspotmail.com
+Closes: https://syzkaller.appspot.com/bug?extid=72bd3dd3a5d5f39a0271
+Fixes: 5cfd31c5b3a3 ("drm/virtio: fix virtio_gpu_cursor_plane_update().")
+Cc: stable@vger.kernel.org
+Signed-off-by: Deepanshu Kartikey <kartikey406@gmail.com>
+Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
+Link: https://patch.msgid.link/20260519082247.34470-1-kartikey406@gmail.com
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/gpu/drm/virtio/virtgpu_drv.h | 1 +
+ drivers/gpu/drm/virtio/virtgpu_gem.c | 17 +++++++++++++++++
+ drivers/gpu/drm/virtio/virtgpu_plane.c | 10 ++++++++--
+ 3 files changed, 26 insertions(+), 2 deletions(-)
+
+--- a/drivers/gpu/drm/virtio/virtgpu_drv.h
++++ b/drivers/gpu/drm/virtio/virtgpu_drv.h
+@@ -311,6 +311,7 @@ virtio_gpu_array_from_handles(struct drm
+ void virtio_gpu_array_add_obj(struct virtio_gpu_object_array *objs,
+ struct drm_gem_object *obj);
+ int virtio_gpu_array_lock_resv(struct virtio_gpu_object_array *objs);
++int virtio_gpu_lock_one_resv_uninterruptible(struct virtio_gpu_object_array *objs);
+ void virtio_gpu_array_unlock_resv(struct virtio_gpu_object_array *objs);
+ void virtio_gpu_array_add_fence(struct virtio_gpu_object_array *objs,
+ struct dma_fence *fence);
+--- a/drivers/gpu/drm/virtio/virtgpu_gem.c
++++ b/drivers/gpu/drm/virtio/virtgpu_gem.c
+@@ -236,6 +236,23 @@ int virtio_gpu_array_lock_resv(struct vi
+ return ret;
+ }
+
++int virtio_gpu_lock_one_resv_uninterruptible(struct virtio_gpu_object_array *objs)
++{
++ int ret;
++
++ if (objs->nents != 1)
++ return -EINVAL;
++
++ dma_resv_lock(objs->objs[0]->resv, NULL);
++
++ ret = dma_resv_reserve_fences(objs->objs[0]->resv, 1);
++ if (ret) {
++ virtio_gpu_array_unlock_resv(objs);
++ return ret;
++ }
++ return 0;
++}
++
+ void virtio_gpu_array_unlock_resv(struct virtio_gpu_object_array *objs)
+ {
+ if (objs->nents == 1) {
+--- a/drivers/gpu/drm/virtio/virtgpu_plane.c
++++ b/drivers/gpu/drm/virtio/virtgpu_plane.c
+@@ -158,7 +158,10 @@ static void virtio_gpu_resource_flush(st
+ if (!objs)
+ return;
+ virtio_gpu_array_add_obj(objs, vgfb->base.obj[0]);
+- virtio_gpu_array_lock_resv(objs);
++ if (virtio_gpu_lock_one_resv_uninterruptible(objs)) {
++ virtio_gpu_array_put_free(objs);
++ return;
++ }
+ virtio_gpu_cmd_resource_flush(vgdev, bo->hw_res_handle, x, y,
+ width, height, objs,
+ vgplane_st->fence);
+@@ -329,7 +332,10 @@ static void virtio_gpu_cursor_plane_upda
+ if (!objs)
+ return;
+ virtio_gpu_array_add_obj(objs, vgfb->base.obj[0]);
+- virtio_gpu_array_lock_resv(objs);
++ if (virtio_gpu_lock_one_resv_uninterruptible(objs)) {
++ virtio_gpu_array_put_free(objs);
++ return;
++ }
+ virtio_gpu_cmd_transfer_to_host_2d
+ (vgdev, 0,
+ plane->state->crtc_w,
--- /dev/null
+From 43cae21424ff8e33894a0f86c6b80b840c049fd7 Mon Sep 17 00:00:00 2001
+From: Abdurrahman Hussain <abdurrahman@nexthop.ai>
+Date: Fri, 15 May 2026 15:11:51 -0700
+Subject: hwmon: (pmbus/adm1266) bounce blackbox records through a protocol-sized buffer
+
+From: Abdurrahman Hussain <abdurrahman@nexthop.ai>
+
+commit 43cae21424ff8e33894a0f86c6b80b840c049fd7 upstream.
+
+adm1266_pmbus_block_xfer() copies the device-supplied block payload
+into the caller-provided buffer using the device-supplied length:
+
+ memcpy(data_r, &msgs[1].buf[1], msgs[1].buf[0]);
+
+The helper does not know how large data_r is and trusts the device to
+return at most one record's worth of bytes. adm1266_nvmem_read_blackbox()
+violates that contract: it advances read_buff inside data->dev_mem in
+ADM1266_BLACKBOX_SIZE (64-byte) strides while the helper is willing to
+write up to ADM1266_PMBUS_BLOCK_MAX (255) bytes. A device that returns
+more than 64 bytes on the trailing record (read_buff offset 1984 in
+the 2048-byte dev_mem allocation) overflows dev_mem by up to 191 bytes
+before the post-call
+
+ if (ret != ADM1266_BLACKBOX_SIZE)
+ return -EIO;
+
+can reject the response.
+
+Contain the fix in the caller without changing the helper signature:
+read each record into a 255-byte local bounce buffer that matches the
+helper's maximum output, validate the returned length, and only then
+copy exactly ADM1266_BLACKBOX_SIZE bytes into the dev_mem slot.
+
+Fixes: 407dc802a9c0 ("hwmon: (pmbus/adm1266) Add Block process call")
+Cc: stable@vger.kernel.org
+Signed-off-by: Abdurrahman Hussain <abdurrahman@nexthop.ai>
+Link: https://lore.kernel.org/r/20260515-adm1266-fixes-v1-5-1c1ea1349cfe@nexthop.ai
+Signed-off-by: Guenter Roeck <linux@roeck-us.net>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/hwmon/pmbus/adm1266.c | 4 +++-
+ 1 file changed, 3 insertions(+), 1 deletion(-)
+
+--- a/drivers/hwmon/pmbus/adm1266.c
++++ b/drivers/hwmon/pmbus/adm1266.c
+@@ -350,6 +350,7 @@ static void adm1266_init_debugfs(struct
+
+ static int adm1266_nvmem_read_blackbox(struct adm1266_data *data, u8 *read_buff)
+ {
++ u8 record[ADM1266_PMBUS_BLOCK_MAX];
+ int record_count;
+ char index;
+ u8 buf[I2C_SMBUS_BLOCK_MAX];
+@@ -367,13 +368,14 @@ static int adm1266_nvmem_read_blackbox(s
+ return -EIO;
+
+ for (index = 0; index < record_count; index++) {
+- ret = adm1266_pmbus_block_xfer(data, ADM1266_READ_BLACKBOX, 1, &index, read_buff);
++ ret = adm1266_pmbus_block_xfer(data, ADM1266_READ_BLACKBOX, 1, &index, record);
+ if (ret < 0)
+ return ret;
+
+ if (ret != ADM1266_BLACKBOX_SIZE)
+ return -EIO;
+
++ memcpy(read_buff, record, ADM1266_BLACKBOX_SIZE);
+ read_buff += ADM1266_BLACKBOX_SIZE;
+ }
+
--- /dev/null
+From d7834d92251baade796812876e95555e2066fa9f Mon Sep 17 00:00:00 2001
+From: Abdurrahman Hussain <abdurrahman@nexthop.ai>
+Date: Mon, 18 May 2026 17:52:25 -0700
+Subject: hwmon: (pmbus/adm1266) cap PDIO scan in get_multiple at ADM1266_PDIO_NR
+
+From: Abdurrahman Hussain <abdurrahman@nexthop.ai>
+
+commit d7834d92251baade796812876e95555e2066fa9f upstream.
+
+adm1266_gpio_get_multiple() iterates the PDIO portion of the
+caller-supplied mask using
+
+ for_each_set_bit_from(gpio_nr, mask,
+ ADM1266_GPIO_NR + ADM1266_PDIO_STATUS) {
+ ...
+ }
+
+where ADM1266_PDIO_STATUS is the PMBus command code (0xE9, i.e. 233),
+not the number of PDIO pins. The intended upper bound is
+ADM1266_GPIO_NR + ADM1266_PDIO_NR = 25.
+
+gpiolib hands in a mask sized for gc.ngpio (= 25 bits on this chip),
+so the iteration walks find_next_bit() up to 242, reading up to 217
+extra bits (a handful of unsigned-long words: four on 64-bit, seven
+on 32-bit) of whatever lives past the end of the mask in the
+caller's stack. Any incidental set bit in that range then drives a
+set_bit(gpio_nr, bits) call that writes past the end of the
+caller-supplied bits array too -- both out-of-bounds.
+
+Substitute ADM1266_PDIO_NR for the constant so the scan stops at the
+last real PDIO bit.
+
+Fixes: d98dfad35c38 ("hwmon: (pmbus/adm1266) Add support for GPIOs")
+Cc: stable@vger.kernel.org
+Signed-off-by: Abdurrahman Hussain <abdurrahman@nexthop.ai>
+Reviewed-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
+Reviewed-by: Linus Walleij <linusw@kernel.org>
+Link: https://lore.kernel.org/r/20260518-adm1266-gpio-fixes-v3-1-e425e4f88139@nexthop.ai
+Signed-off-by: Guenter Roeck <linux@roeck-us.net>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/hwmon/pmbus/adm1266.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+--- a/drivers/hwmon/pmbus/adm1266.c
++++ b/drivers/hwmon/pmbus/adm1266.c
+@@ -212,7 +212,7 @@ static int adm1266_gpio_get_multiple(str
+ status = read_buf[0] + (read_buf[1] << 8);
+
+ *bits = 0;
+- for_each_set_bit_from(gpio_nr, mask, ADM1266_GPIO_NR + ADM1266_PDIO_STATUS) {
++ for_each_set_bit_from(gpio_nr, mask, ADM1266_GPIO_NR + ADM1266_PDIO_NR) {
+ if (test_bit(gpio_nr - ADM1266_GPIO_NR, &status))
+ set_bit(gpio_nr, bits);
+ }
--- /dev/null
+From 3327a12aee9e10ffa903e28b8445dfd1af5307c0 Mon Sep 17 00:00:00 2001
+From: Abdurrahman Hussain <abdurrahman@nexthop.ai>
+Date: Mon, 18 May 2026 17:52:26 -0700
+Subject: hwmon: (pmbus/adm1266) don't clobber GPIO bits before PDIO read in get_multiple
+
+From: Abdurrahman Hussain <abdurrahman@nexthop.ai>
+
+commit 3327a12aee9e10ffa903e28b8445dfd1af5307c0 upstream.
+
+adm1266_gpio_get_multiple() zeroes *bits before the GPIO_STATUS loop
+and then a second time before the PDIO_STATUS loop:
+
+ *bits = 0;
+ for_each_set_bit(gpio_nr, mask, ADM1266_GPIO_NR) {
+ ...
+ set_bit(gpio_nr, bits);
+ }
+
+ ret = i2c_smbus_read_block_data(data->client, ADM1266_PDIO_STATUS, ...);
+ ...
+ *bits = 0;
+ for_each_set_bit_from(gpio_nr, mask, ADM1266_GPIO_NR + ADM1266_PDIO_NR) {
+ ...
+ set_bit(gpio_nr, bits);
+ }
+
+The second *bits = 0 throws away every GPIO bit the first loop just
+populated, so callers asking for any combination of GPIO and PDIO
+pins always see the GPIO portion of the returned bits as zero.
+
+Drop the redundant second assignment so both halves of the result
+survive.
+
+Fixes: d98dfad35c38 ("hwmon: (pmbus/adm1266) Add support for GPIOs")
+Cc: stable@vger.kernel.org
+Signed-off-by: Abdurrahman Hussain <abdurrahman@nexthop.ai>
+Reviewed-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
+Reviewed-by: Linus Walleij <linusw@kernel.org>
+Link: https://lore.kernel.org/r/20260518-adm1266-gpio-fixes-v3-2-e425e4f88139@nexthop.ai
+Signed-off-by: Guenter Roeck <linux@roeck-us.net>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/hwmon/pmbus/adm1266.c | 1 -
+ 1 file changed, 1 deletion(-)
+
+--- a/drivers/hwmon/pmbus/adm1266.c
++++ b/drivers/hwmon/pmbus/adm1266.c
+@@ -211,7 +211,6 @@ static int adm1266_gpio_get_multiple(str
+
+ status = read_buf[0] + (read_buf[1] << 8);
+
+- *bits = 0;
+ for_each_set_bit_from(gpio_nr, mask, ADM1266_GPIO_NR + ADM1266_PDIO_NR) {
+ if (test_bit(gpio_nr - ADM1266_GPIO_NR, &status))
+ set_bit(gpio_nr, bits);
--- /dev/null
+From 487566cb1ccdf3756fdd7bf8d875e612ff3169bb Mon Sep 17 00:00:00 2001
+From: Abdurrahman Hussain <abdurrahman@nexthop.ai>
+Date: Fri, 15 May 2026 15:11:50 -0700
+Subject: hwmon: (pmbus/adm1266) include PEC byte in pmbus_block_xfer read buffer
+
+From: Abdurrahman Hussain <abdurrahman@nexthop.ai>
+
+commit 487566cb1ccdf3756fdd7bf8d875e612ff3169bb upstream.
+
+adm1266_pmbus_block_xfer() sets up the read transaction with
+
+ .buf = data->read_buf,
+ .len = ADM1266_PMBUS_BLOCK_MAX + 2,
+
+but read_buf in struct adm1266_data is declared as
+
+ u8 read_buf[ADM1266_PMBUS_BLOCK_MAX + 1];
+
+For a max-length block response (length byte = 255 + up to 1 PEC
+byte), the i2c controller is told to write 257 bytes into a 256-byte
+buffer, putting one byte past the end of read_buf. The same response
+also makes the subsequent PEC compare
+
+ if (crc != msgs[1].buf[msgs[1].buf[0] + 1])
+
+read a byte beyond the array.
+
+Bump the read_buf declaration to ADM1266_PMBUS_BLOCK_MAX + 2 so the
+buffer can hold the length byte, up to 255 payload bytes, and the PEC
+byte the i2c_msg length already accounts for.
+
+Fixes: 407dc802a9c0 ("hwmon: (pmbus/adm1266) Add Block process call")
+Cc: stable@vger.kernel.org
+Signed-off-by: Abdurrahman Hussain <abdurrahman@nexthop.ai>
+Link: https://lore.kernel.org/r/20260515-adm1266-fixes-v1-4-1c1ea1349cfe@nexthop.ai
+Signed-off-by: Guenter Roeck <linux@roeck-us.net>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/hwmon/pmbus/adm1266.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+--- a/drivers/hwmon/pmbus/adm1266.c
++++ b/drivers/hwmon/pmbus/adm1266.c
+@@ -61,7 +61,7 @@ struct adm1266_data {
+ u8 *dev_mem;
+ struct mutex buf_mutex;
+ u8 write_buf[ADM1266_PMBUS_BLOCK_MAX + 1] ____cacheline_aligned;
+- u8 read_buf[ADM1266_PMBUS_BLOCK_MAX + 1] ____cacheline_aligned;
++ u8 read_buf[ADM1266_PMBUS_BLOCK_MAX + 2] ____cacheline_aligned;
+ };
+
+ static const struct nvmem_cell_info adm1266_nvmem_cells[] = {
--- /dev/null
+From 491403b9b76cf66abd81301c5901aa4a4549f1e8 Mon Sep 17 00:00:00 2001
+From: Abdurrahman Hussain <abdurrahman@nexthop.ai>
+Date: Mon, 18 May 2026 17:52:28 -0700
+Subject: hwmon: (pmbus/adm1266) register the gpio_chip after pmbus_do_probe()
+
+From: Abdurrahman Hussain <abdurrahman@nexthop.ai>
+
+commit 491403b9b76cf66abd81301c5901aa4a4549f1e8 upstream.
+
+adm1266_probe() calls adm1266_config_gpio() -- which goes on to
+devm_gpiochip_add_data() and exposes the gpio_chip callbacks to
+gpiolib -- before pmbus_do_probe() has initialised the per-client
+PMBus state (notably the pmbus_lock mutex the core hands out via
+pmbus_get_data()).
+
+That ordering is already a latent hazard: any GPIO access that lands
+between adm1266_config_gpio() and the end of pmbus_do_probe() (for
+example a sysfs read from a user space agent that opens the gpiochip
+the instant gpiolib advertises it) races pmbus_do_probe()'s own
+device accesses with no serialisation.
+
+Move adm1266_config_gpio() down past pmbus_do_probe() so the chip
+isn't reachable from userspace until the PMBus state it depends on
+is fully initialised.
+
+Fixes: d98dfad35c38 ("hwmon: (pmbus/adm1266) Add support for GPIOs")
+Cc: stable@vger.kernel.org
+Signed-off-by: Abdurrahman Hussain <abdurrahman@nexthop.ai>
+Reviewed-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
+Link: https://lore.kernel.org/r/20260518-adm1266-gpio-fixes-v3-4-e425e4f88139@nexthop.ai
+Signed-off-by: Guenter Roeck <linux@roeck-us.net>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/hwmon/pmbus/adm1266.c | 8 ++++----
+ 1 file changed, 4 insertions(+), 4 deletions(-)
+
+--- a/drivers/hwmon/pmbus/adm1266.c
++++ b/drivers/hwmon/pmbus/adm1266.c
+@@ -470,10 +470,6 @@ static int adm1266_probe(struct i2c_clie
+ crc8_populate_msb(pmbus_crc_table, 0x7);
+ mutex_init(&data->buf_mutex);
+
+- ret = adm1266_config_gpio(data);
+- if (ret < 0)
+- return ret;
+-
+ ret = adm1266_set_rtc(data);
+ if (ret < 0)
+ return ret;
+@@ -486,6 +482,10 @@ static int adm1266_probe(struct i2c_clie
+ if (ret)
+ return ret;
+
++ ret = adm1266_config_gpio(data);
++ if (ret < 0)
++ return ret;
++
+ adm1266_init_debugfs(data);
+
+ return 0;
--- /dev/null
+From 6af713af91d5c34ec049eb3cc2c5b3f5eba953b8 Mon Sep 17 00:00:00 2001
+From: Abdurrahman Hussain <abdurrahman@nexthop.ai>
+Date: Mon, 18 May 2026 17:52:29 -0700
+Subject: hwmon: (pmbus/adm1266) register the nvmem device after pmbus_do_probe()
+
+From: Abdurrahman Hussain <abdurrahman@nexthop.ai>
+
+commit 6af713af91d5c34ec049eb3cc2c5b3f5eba953b8 upstream.
+
+adm1266_probe() calls adm1266_config_nvmem() -- which goes on to
+devm_nvmem_register() and exposes adm1266_nvmem_read() to userspace --
+before pmbus_do_probe() has initialised the per-client PMBus state.
+
+Same latent hazard as the gpio_chip one fixed in the previous patch:
+once the nvmem device is registered, gpiolib's nvmem char-dev / sysfs
+interface is reachable, and any concurrent read triggers
+adm1266_nvmem_read() -> adm1266_nvmem_read_blackbox(), which issues
+PMBus traffic that races pmbus_do_probe()'s own device accesses with
+no serialisation.
+
+Move adm1266_config_nvmem() down past pmbus_do_probe() so the nvmem
+device isn't reachable from userspace until the PMBus state the
+nvmem accessors depend on is fully initialised.
+
+Fixes: 15609d189302 ("hwmon: (pmbus/adm1266) read blackbox")
+Cc: stable@vger.kernel.org
+Signed-off-by: Abdurrahman Hussain <abdurrahman@nexthop.ai>
+Link: https://lore.kernel.org/r/20260518-adm1266-gpio-fixes-v3-5-e425e4f88139@nexthop.ai
+Signed-off-by: Guenter Roeck <linux@roeck-us.net>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/hwmon/pmbus/adm1266.c | 8 ++++----
+ 1 file changed, 4 insertions(+), 4 deletions(-)
+
+--- a/drivers/hwmon/pmbus/adm1266.c
++++ b/drivers/hwmon/pmbus/adm1266.c
+@@ -474,14 +474,14 @@ static int adm1266_probe(struct i2c_clie
+ if (ret < 0)
+ return ret;
+
+- ret = adm1266_config_nvmem(data);
+- if (ret < 0)
+- return ret;
+-
+ ret = pmbus_do_probe(client, &data->info);
+ if (ret)
+ return ret;
+
++ ret = adm1266_config_nvmem(data);
++ if (ret < 0)
++ return ret;
++
+ ret = adm1266_config_gpio(data);
+ if (ret < 0)
+ return ret;
--- /dev/null
+From 4afca954622d672ea65ed961bed01cf91caa034e Mon Sep 17 00:00:00 2001
+From: Abdurrahman Hussain <abdurrahman@nexthop.ai>
+Date: Fri, 15 May 2026 15:11:49 -0700
+Subject: hwmon: (pmbus/adm1266) reject implausible blackbox record_count
+
+From: Abdurrahman Hussain <abdurrahman@nexthop.ai>
+
+commit 4afca954622d672ea65ed961bed01cf91caa034e upstream.
+
+adm1266_nvmem_read_blackbox() loops over a record_count that comes
+straight from byte 3 of the BLACKBOX_INFO response. The destination
+buffer is data->dev_mem, sized for the nvmem cell's declared 2048
+bytes (ADM1266_BLACKBOX_MAX_RECORDS * ADM1266_BLACKBOX_SIZE = 32 * 64).
+A device that reports a record_count greater than 32 -- whether due
+to firmware bugs, bus corruption, or a non-responsive slave returning
+0xff -- would walk read_buff past the end of the dev_mem allocation
+on the trailing iterations.
+
+Cap record_count at ADM1266_BLACKBOX_MAX_RECORDS (introduced here)
+before entering the loop and return -EIO on any larger value, so a
+malformed BLACKBOX_INFO response cannot drive the loop out of bounds.
+
+Fixes: 15609d189302 ("hwmon: (pmbus/adm1266) read blackbox")
+Cc: stable@vger.kernel.org
+Signed-off-by: Abdurrahman Hussain <abdurrahman@nexthop.ai>
+Link: https://lore.kernel.org/r/20260515-adm1266-fixes-v1-3-1c1ea1349cfe@nexthop.ai
+Signed-off-by: Guenter Roeck <linux@roeck-us.net>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/hwmon/pmbus/adm1266.c | 3 +++
+ 1 file changed, 3 insertions(+)
+
+--- a/drivers/hwmon/pmbus/adm1266.c
++++ b/drivers/hwmon/pmbus/adm1266.c
+@@ -46,6 +46,7 @@
+
+ #define ADM1266_BLACKBOX_OFFSET 0
+ #define ADM1266_BLACKBOX_SIZE 64
++#define ADM1266_BLACKBOX_MAX_RECORDS 32
+
+ #define ADM1266_PMBUS_BLOCK_MAX 255
+
+@@ -362,6 +363,8 @@ static int adm1266_nvmem_read_blackbox(s
+ return -EIO;
+
+ record_count = buf[3];
++ if (record_count > ADM1266_BLACKBOX_MAX_RECORDS)
++ return -EIO;
+
+ for (index = 0; index < record_count; index++) {
+ ret = adm1266_pmbus_block_xfer(data, ADM1266_READ_BLACKBOX, 1, &index, read_buff);
--- /dev/null
+From a7232f68c43ca62f545049b7f5fbfc75137b843b Mon Sep 17 00:00:00 2001
+From: Abdurrahman Hussain <abdurrahman@nexthop.ai>
+Date: Mon, 18 May 2026 17:52:27 -0700
+Subject: hwmon: (pmbus/adm1266) reject short block-read responses in the GPIO accessors
+
+From: Abdurrahman Hussain <abdurrahman@nexthop.ai>
+
+commit a7232f68c43ca62f545049b7f5fbfc75137b843b upstream.
+
+adm1266_gpio_get() and adm1266_gpio_get_multiple() both compose the
+pin-status word as
+
+ pins_status = read_buf[0] + (read_buf[1] << 8);
+
+right after i2c_smbus_read_block_data(), guarding only against an
+error return. A well-behaved device returns 2 bytes for
+GPIO_STATUS/PDIO_STATUS, but the helper happily reports a 0- or
+1-byte response too. If the device returns 0 bytes, both read_buf
+slots are uninitialized stack memory; if it returns 1 byte, read_buf[1]
+is.
+
+The composed value then flows through set_bit() into the caller's
+*bits in adm1266_gpio_get_multiple(), or into the return value of
+adm1266_gpio_get(), and ends up in userspace via gpiolib (sysfs and
+the char-dev ioctls). That leaks a few bits of kernel stack per
+request on any device whose firmware glitch, bus error, or hostile
+slave produces a short block-read response.
+
+Add the missing length check to both call sites and surface a short
+response as -EIO.
+
+Fixes: d98dfad35c38 ("hwmon: (pmbus/adm1266) Add support for GPIOs")
+Cc: stable@vger.kernel.org
+Signed-off-by: Abdurrahman Hussain <abdurrahman@nexthop.ai>
+Reviewed-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
+Link: https://lore.kernel.org/r/20260518-adm1266-gpio-fixes-v3-3-e425e4f88139@nexthop.ai
+Signed-off-by: Guenter Roeck <linux@roeck-us.net>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/hwmon/pmbus/adm1266.c | 6 ++++++
+ 1 file changed, 6 insertions(+)
+
+--- a/drivers/hwmon/pmbus/adm1266.c
++++ b/drivers/hwmon/pmbus/adm1266.c
+@@ -176,6 +176,8 @@ static int adm1266_gpio_get(struct gpio_
+ ret = i2c_smbus_read_block_data(data->client, pmbus_cmd, read_buf);
+ if (ret < 0)
+ return ret;
++ if (ret < 2)
++ return -EIO;
+
+ pins_status = read_buf[0] + (read_buf[1] << 8);
+ if (offset < ADM1266_GPIO_NR)
+@@ -196,6 +198,8 @@ static int adm1266_gpio_get_multiple(str
+ ret = i2c_smbus_read_block_data(data->client, ADM1266_GPIO_STATUS, read_buf);
+ if (ret < 0)
+ return ret;
++ if (ret < 2)
++ return -EIO;
+
+ status = read_buf[0] + (read_buf[1] << 8);
+
+@@ -208,6 +212,8 @@ static int adm1266_gpio_get_multiple(str
+ ret = i2c_smbus_read_block_data(data->client, ADM1266_PDIO_STATUS, read_buf);
+ if (ret < 0)
+ return ret;
++ if (ret < 2)
++ return -EIO;
+
+ status = read_buf[0] + (read_buf[1] << 8);
+
--- /dev/null
+From b86095e3d7dcf2bf80c747349a35912a87a85098 Mon Sep 17 00:00:00 2001
+From: Abdurrahman Hussain <abdurrahman@nexthop.ai>
+Date: Fri, 15 May 2026 15:11:47 -0700
+Subject: hwmon: (pmbus/adm1266) seed timestamp from the real-time clock
+
+From: Abdurrahman Hussain <abdurrahman@nexthop.ai>
+
+commit b86095e3d7dcf2bf80c747349a35912a87a85098 upstream.
+
+adm1266_set_rtc() seeds the chip's SET_RTC register from
+ktime_get_seconds(), which returns CLOCK_MONOTONIC -- i.e. seconds
+since the host last booted, not seconds since the Unix epoch.
+
+The chip stamps that value into every blackbox record it captures.
+Userspace reading those timestamps back expects wall-clock seconds:
+that's what the SET_RTC frame layout documents (datasheet Rev. D,
+Table 84) and what every other consumer of "seconds since epoch"
+assumes. Seeding from CLOCK_MONOTONIC gives blackbox records a
+timestamp that is only meaningful within a single boot of the host
+and silently resets to small values on every reboot.
+
+Switch to ktime_get_real_seconds() so the seed matches what the
+register is documented to hold.
+
+Fixes: 15609d189302 ("hwmon: (pmbus/adm1266) read blackbox")
+Cc: stable@vger.kernel.org
+Signed-off-by: Abdurrahman Hussain <abdurrahman@nexthop.ai>
+Link: https://lore.kernel.org/r/20260515-adm1266-fixes-v1-1-1c1ea1349cfe@nexthop.ai
+Signed-off-by: Guenter Roeck <linux@roeck-us.net>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/hwmon/pmbus/adm1266.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+--- a/drivers/hwmon/pmbus/adm1266.c
++++ b/drivers/hwmon/pmbus/adm1266.c
+@@ -436,7 +436,7 @@ static int adm1266_set_rtc(struct adm126
+ char write_buf[6];
+ int i;
+
+- kt = ktime_get_seconds();
++ kt = ktime_get_real_seconds();
+
+ memset(write_buf, 0, sizeof(write_buf));
+
--- /dev/null
+From bab8c6fb5af8df7e753d196c1262cb78e92ca872 Mon Sep 17 00:00:00 2001
+From: Abdurrahman Hussain <abdurrahman@nexthop.ai>
+Date: Mon, 18 May 2026 17:52:30 -0700
+Subject: hwmon: (pmbus/adm1266) serialize GPIO PMBus accesses with pmbus_lock
+
+From: Abdurrahman Hussain <abdurrahman@nexthop.ai>
+
+commit bab8c6fb5af8df7e753d196c1262cb78e92ca872 upstream.
+
+adm1266_gpio_get(), adm1266_gpio_get_multiple(), and
+adm1266_gpio_dbg_show() all issue PMBus reads against the device but
+none of them take pmbus_lock. The pmbus_core framework holds
+pmbus_lock around its own multi-transaction sequences (notably the
+"set PAGE, then read paged register" pattern used by hwmon
+attributes), so an unlocked GPIO accessor can land between a PAGE
+write and the subsequent paged read in another thread and corrupt
+either side's view of the device state machine.
+
+Take pmbus_lock at the top of each of the three accessors via the
+scope-based guard(). The lock is uncontended in the common case and
+adds only a single mutex round-trip per call.
+
+Fixes: d98dfad35c38 ("hwmon: (pmbus/adm1266) Add support for GPIOs")
+Cc: stable@vger.kernel.org
+Signed-off-by: Abdurrahman Hussain <abdurrahman@nexthop.ai>
+Reviewed-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>
+Link: https://lore.kernel.org/r/20260518-adm1266-gpio-fixes-v3-6-e425e4f88139@nexthop.ai
+Signed-off-by: Guenter Roeck <linux@roeck-us.net>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/hwmon/pmbus/adm1266.c | 6 ++++++
+ 1 file changed, 6 insertions(+)
+
+--- a/drivers/hwmon/pmbus/adm1266.c
++++ b/drivers/hwmon/pmbus/adm1266.c
+@@ -173,6 +173,8 @@ static int adm1266_gpio_get(struct gpio_
+ else
+ pmbus_cmd = ADM1266_PDIO_STATUS;
+
++ guard(pmbus_lock)(data->client);
++
+ ret = i2c_smbus_read_block_data(data->client, pmbus_cmd, read_buf);
+ if (ret < 0)
+ return ret;
+@@ -195,6 +197,8 @@ static int adm1266_gpio_get_multiple(str
+ unsigned int gpio_nr;
+ int ret;
+
++ guard(pmbus_lock)(data->client);
++
+ ret = i2c_smbus_read_block_data(data->client, ADM1266_GPIO_STATUS, read_buf);
+ if (ret < 0)
+ return ret;
+@@ -236,6 +240,8 @@ static void adm1266_gpio_dbg_show(struct
+ int ret;
+ int i;
+
++ guard(pmbus_lock)(data->client);
++
+ for (i = 0; i < ADM1266_GPIO_NR; i++) {
+ write_cmd = adm1266_gpio_mapping[i][1];
+ ret = adm1266_pmbus_block_xfer(data, ADM1266_GPIO_CONFIG, 1, &write_cmd, read_buf);
--- /dev/null
+From 9f1dd8f9491eb840cbea7ffdf4cad031e25f8ae0 Mon Sep 17 00:00:00 2001
+From: Abdurrahman Hussain <abdurrahman@nexthop.ai>
+Date: Mon, 18 May 2026 17:52:31 -0700
+Subject: hwmon: (pmbus/adm1266) serialize NVMEM blackbox read with pmbus_lock
+
+From: Abdurrahman Hussain <abdurrahman@nexthop.ai>
+
+commit 9f1dd8f9491eb840cbea7ffdf4cad031e25f8ae0 upstream.
+
+adm1266_nvmem_read() is the reg_read callback the NVMEM core invokes
+when userspace reads /sys/bus/nvmem/devices/.../nvmem on this chip.
+On the first byte of every read it does a memset of data->dev_mem,
+walks the device blackbox through adm1266_nvmem_read_blackbox()
+(which issues a chain of PMBus block transactions), and then memcpys
+the refreshed buffer out to userspace. None of that runs under
+pmbus_lock today.
+
+Two consequences:
+
+ - The PMBus traffic the refresh issues is not serialised against
+ pmbus_core's own multi-step PAGE+register sequences. A paged
+ hwmon attribute read from another thread can land between a
+ PAGE write and the paged read in either direction and corrupt
+ one side's view of the device state machine.
+
+ - The NVMEM core does not serialise concurrent reg_read calls, so
+ two userspace readers racing at offset 0 can interleave the
+ memset of data->dev_mem with another reader's
+ adm1266_nvmem_read_blackbox() refill or memcpy out, returning
+ torn data to userspace.
+
+Take pmbus_lock at the top of adm1266_nvmem_read() via the
+scope-based guard(). Patch 5 of this series moves
+adm1266_config_nvmem() past pmbus_do_probe() so the lock is
+guaranteed to be live before the callback is reachable from
+userspace.
+
+Fixes: 15609d189302 ("hwmon: (pmbus/adm1266) read blackbox")
+Cc: stable@vger.kernel.org
+Signed-off-by: Abdurrahman Hussain <abdurrahman@nexthop.ai>
+Link: https://lore.kernel.org/r/20260518-adm1266-gpio-fixes-v3-7-e425e4f88139@nexthop.ai
+Signed-off-by: Guenter Roeck <linux@roeck-us.net>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/hwmon/pmbus/adm1266.c | 2 ++
+ 1 file changed, 2 insertions(+)
+
+--- a/drivers/hwmon/pmbus/adm1266.c
++++ b/drivers/hwmon/pmbus/adm1266.c
+@@ -385,6 +385,8 @@ static int adm1266_nvmem_read(void *priv
+ if (offset + bytes > data->nvmem_config.size)
+ return -EINVAL;
+
++ guard(pmbus_lock)(data->client);
++
+ if (offset == 0) {
+ memset(data->dev_mem, 0, data->nvmem_config.size);
+
--- /dev/null
+From 4e4af55aaca7f6d7673d5f9889ad0529db86a048 Mon Sep 17 00:00:00 2001
+From: Abdurrahman Hussain <abdurrahman@nexthop.ai>
+Date: Mon, 18 May 2026 17:52:32 -0700
+Subject: hwmon: (pmbus/adm1266) serialize sequencer_state debugfs read with pmbus_lock
+
+From: Abdurrahman Hussain <abdurrahman@nexthop.ai>
+
+commit 4e4af55aaca7f6d7673d5f9889ad0529db86a048 upstream.
+
+adm1266_state_read() backs the sequencer_state debugfs entry and
+issues an i2c_smbus_read_word_data(client, ADM1266_READ_STATE)
+against the device without taking pmbus_lock. pmbus_core holds
+pmbus_lock around its own multi-transaction sequences (notably the
+"set PAGE, then read paged register" pattern used by hwmon
+attributes), so an unlocked debugfs reader can land between a PAGE
+write and the subsequent paged read in another thread. READ_STATE
+itself is not paged, so it cannot corrupt PAGE in flight, but the
+same defensive serialisation that applies to the GPIO accessors
+applies here: any direct device access from outside pmbus_core
+should be ordered with respect to pmbus_core's own.
+
+Take pmbus_lock at the top of adm1266_state_read() via the
+scope-based guard().
+
+Fixes: ed1ff457e187 ("hwmon: (pmbus/adm1266) add debugfs for states")
+Cc: stable@vger.kernel.org
+Signed-off-by: Abdurrahman Hussain <abdurrahman@nexthop.ai>
+Link: https://lore.kernel.org/r/20260518-adm1266-gpio-fixes-v3-8-e425e4f88139@nexthop.ai
+Signed-off-by: Guenter Roeck <linux@roeck-us.net>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/hwmon/pmbus/adm1266.c | 1 +
+ 1 file changed, 1 insertion(+)
+
+--- a/drivers/hwmon/pmbus/adm1266.c
++++ b/drivers/hwmon/pmbus/adm1266.c
+@@ -334,6 +334,7 @@ static int adm1266_state_read(struct seq
+ struct i2c_client *client = to_i2c_client(dev);
+ int ret;
+
++ guard(pmbus_lock)(client);
+ ret = i2c_smbus_read_word_data(client, ADM1266_READ_STATE);
+ if (ret < 0)
+ return ret;
--- /dev/null
+From 9ce754ed8e7ab4e3999767ce1505f85c449ccb07 Mon Sep 17 00:00:00 2001
+From: Michael Bommarito <michael.bommarito@gmail.com>
+Date: Tue, 19 May 2026 09:25:19 -0400
+Subject: KVM: arm64: vgic-its: Reject restored DTE with out-of-range num_eventid_bits
+
+From: Michael Bommarito <michael.bommarito@gmail.com>
+
+commit 9ce754ed8e7ab4e3999767ce1505f85c449ccb07 upstream.
+
+Userspace can restore an ITS Device Table Entry whose Size field encodes
+more EventID bits than the virtual ITS supports. The live MAPD path
+rejects that state, but vgic_its_restore_dte() accepts it and stores the
+out-of-range value in dev->num_eventid_bits.
+
+Reject restored DTEs with num_eventid_bits > VITS_TYPER_IDBITS before
+allocating the device. This mirrors the MAPD check and prevents the
+restored state from reaching vgic_its_restore_itt(), where the unchecked
+value can be converted into an oversized scan_its_table() range.
+
+Fixes: 57a9a117154c ("KVM: arm64: vgic-its: Device table save/restore")
+Assisted-by: Claude:claude-opus-4-7
+Signed-off-by: Michael Bommarito <michael.bommarito@gmail.com>
+Link: https://lore.kernel.org/r/20260519132519.2142458-1-michael.bommarito@gmail.com
+Signed-off-by: Marc Zyngier <maz@kernel.org>
+Cc: stable@vger.kernel.org
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ arch/arm64/kvm/vgic/vgic-its.c | 4 ++++
+ 1 file changed, 4 insertions(+)
+
+--- a/arch/arm64/kvm/vgic/vgic-its.c
++++ b/arch/arm64/kvm/vgic/vgic-its.c
+@@ -2413,6 +2413,10 @@ static int vgic_its_restore_dte(struct v
+ /* dte entry is valid */
+ offset = (entry & KVM_ITS_DTE_NEXT_MASK) >> KVM_ITS_DTE_NEXT_SHIFT;
+
++ /* Mimic the MAPD behaviour and reject invalid EID bits. */
++ if (num_eventid_bits > VITS_TYPER_IDBITS)
++ return -EINVAL;
++
+ if (!vgic_its_check_id(its, baser, id, NULL))
+ return -EINVAL;
+
--- /dev/null
+From 0ccc9d47cf020994097ff51827cebd04aa2b0bf4 Mon Sep 17 00:00:00 2001
+From: Huacai Chen <chenhuacai@loongson.cn>
+Date: Thu, 21 May 2026 20:58:40 +0800
+Subject: LoongArch: Remove unused code to avoid build warning
+
+From: Huacai Chen <chenhuacai@loongson.cn>
+
+commit 0ccc9d47cf020994097ff51827cebd04aa2b0bf4 upstream.
+
+After commit feee6b2989165631b1 ("mm/memory_hotplug: shrink zones when
+offlining memory"), __remove_pages() doesn't need the "zone" parameter
+so the "page" variable is also unused. Remove the unused code to avoid
+such build warning:
+
+arch/loongarch/mm/init.c: In function 'arch_remove_memory':
+arch/loongarch/mm/init.c:134:22: warning: variable 'page' set but not used [-Wunused-but-set-variable=]
+ 134 | struct page *page = pfn_to_page(start_pfn);
+
+Cc: <stable@vger.kernel.org>
+Reviewed-by: Guo Ren <guoren@kernel.org>
+Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ arch/loongarch/mm/init.c | 4 ----
+ 1 file changed, 4 deletions(-)
+
+--- a/arch/loongarch/mm/init.c
++++ b/arch/loongarch/mm/init.c
+@@ -132,11 +132,7 @@ void arch_remove_memory(u64 start, u64 s
+ {
+ unsigned long start_pfn = start >> PAGE_SHIFT;
+ unsigned long nr_pages = size >> PAGE_SHIFT;
+- struct page *page = pfn_to_page(start_pfn);
+
+- /* With altmap the first mapped page is offset from @start */
+- if (altmap)
+- page += vmem_altmap_offset(altmap);
+ __remove_pages(start_pfn, nr_pages, altmap);
+ }
+
--- /dev/null
+From 0ce1bc9e46ecabe84772bb561e373c0d9876d6f2 Mon Sep 17 00:00:00 2001
+From: Michael Bommarito <michael.bommarito@gmail.com>
+Date: Wed, 13 May 2026 13:53:24 -0400
+Subject: RDMA/siw: Reject MPA FPDU length underflow before signed receive math
+
+From: Michael Bommarito <michael.bommarito@gmail.com>
+
+commit 0ce1bc9e46ecabe84772bb561e373c0d9876d6f2 upstream.
+
+A malicious connected siw peer can send an iWARP FPDU whose MPA length
+field (c_hdr->mpa_len, 16 bit big-endian, peer-controlled) is smaller
+than the fixed DDP/RDMAP header for the announced opcode. Soft-iWARP
+parses the full header in siw_get_hdr() based on iwarp_pktinfo[opcode]
+.hdr_len, but never compares mpa_len against that header length.
+
+siw_tcp_rx_data() then derives
+
+ srx->fpdu_part_rem = be16_to_cpu(mpa_len) - fpdu_part_rcvd
+ + MPA_HDR_SIZE;
+
+where fpdu_part_rcvd equals iwarp_pktinfo[opcode].hdr_len at this
+point. For a tagged WRITE (hdr_len 16, MPA_HDR_SIZE 2) the smallest
+on-wire mpa_len of 0 yields fpdu_part_rem = -14, and any mpa_len below
+hdr_len - MPA_HDR_SIZE underflows to a negative int.
+
+The signed value then flows into siw_proc_write()/siw_proc_rresp() as
+
+ bytes = min(srx->fpdu_part_rem, srx->skb_new);
+
+is handed to siw_check_mem() as an int len (whose interval check
+addr + len > mem->va + mem->len is satisfied for a valid base when
+len is negative), and reaches siw_rx_data() -> siw_rx_kva() /
+siw_rx_umem() -> skb_copy_bits() as a signed copy length. The header
+copy branch in skb_copy_bits() promotes that to size_t, producing a
+multi-gigabyte read.
+
+KASAN under a KUnit harness that drives the real kernel TCP receive
+path -- a loopback AF_INET socketpair, the malformed FPDU written via
+kernel_sendmsg, sk_data_ready firing in softirq, tcp_read_sock
+dispatching to siw_tcp_rx_data -- reports:
+
+ BUG: KASAN: use-after-free in skb_copy_bits+0x284/0x480
+ Read of size 4294967295 at addr ffff888...
+ Call Trace:
+ skb_copy_bits
+ siw_rx_kva
+ siw_rx_data
+ siw_check_mem
+ siw_proc_write
+ siw_tcp_rx_data
+ __tcp_read_sock
+ siw_qp_llp_data_ready
+ tcp_data_ready
+ tcp_data_queue
+
+Add the missing invariant at the earliest point where the peer header
+is fully assembled. iwarp_pktinfo[*].hdr_len - MPA_HDR_SIZE is exactly
+the value the siw transmitter uses as the minimum mpa_len for each
+opcode (drivers/infiniband/sw/siw/siw_qp.c:33), so this matches the
+protocol contract. Out-of-range FPDUs terminate the connection with
+TERM_ERROR_LAYER_LLP / LLP_ETYPE_MPA / LLP_ECODE_FPDU_START -- which
+is RFC 5044 Section 8 error code 3 ("Marker and ULPDU Length fields
+do not agree on the start of an FPDU"), the correct framing-error
+class for this inconsistency.
+
+Fixes: 8b6a361b8c48 ("rdma/siw: receive path")
+Link: https://patch.msgid.link/r/20260513175325.2042630-2-michael.bommarito@gmail.com
+Cc: stable@vger.kernel.org
+Signed-off-by: Michael Bommarito <michael.bommarito@gmail.com>
+Assisted-by: Claude:claude-opus-4-7
+Acked-by: Bernard Metzler <bernard.metzler@linux.dev>
+Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/infiniband/sw/siw/siw_qp_rx.c | 15 +++++++++++++++
+ 1 file changed, 15 insertions(+)
+
+--- a/drivers/infiniband/sw/siw/siw_qp_rx.c
++++ b/drivers/infiniband/sw/siw/siw_qp_rx.c
+@@ -1102,6 +1102,21 @@ static int siw_get_hdr(struct siw_rx_str
+ }
+
+ /*
++ * Peer-controlled mpa_len must not underflow srx->fpdu_part_rem
++ * in siw_tcp_rx_data(); a negative value flows as a signed copy
++ * length into siw_check_mem() and skb_copy_bits().
++ */
++ if (unlikely(be16_to_cpu(c_hdr->mpa_len) + MPA_HDR_SIZE <
++ iwarp_pktinfo[opcode].hdr_len)) {
++ pr_warn_ratelimited("siw: short mpa_len %u for opcode %u (hdr_len %u)\n",
++ be16_to_cpu(c_hdr->mpa_len), opcode,
++ iwarp_pktinfo[opcode].hdr_len);
++ siw_init_terminate(rx_qp(srx), TERM_ERROR_LAYER_LLP,
++ LLP_ETYPE_MPA, LLP_ECODE_FPDU_START, 0);
++ return -EINVAL;
++ }
++
++ /*
+ * DDP/RDMAP header receive completed. Check if the current
+ * DDP segment starts a new RDMAP message or continues a previously
+ * started RDMAP message.
--- /dev/null
+From b52a8d52c3125ec9a93106ed816582368de34426 Mon Sep 17 00:00:00 2001
+From: Michael Bommarito <michael.bommarito@gmail.com>
+Date: Sun, 19 Apr 2026 17:04:20 -0400
+Subject: scsi: isci: Fix use-after-free in device removal path
+
+From: Michael Bommarito <michael.bommarito@gmail.com>
+
+commit b52a8d52c3125ec9a93106ed816582368de34426 upstream.
+
+The ISCI completion tasklet is initialized in isci_host_alloc()
+(drivers/scsi/isci/init.c:496) and scheduled from both MSI-X and legacy
+interrupt handlers (drivers/scsi/isci/host.c:223,613).
+
+isci_host_deinit() stops the controller and waits for stop completion,
+but it never kills completion_tasklet before teardown continues. A
+top-of-function tasklet_kill() is not sufficient here: interrupts are
+only disabled when isci_host_stop_complete() runs, so until
+wait_for_stop() returns the IRQ handlers can still requeue the
+tasklet. The tasklet callback also re-enables interrupts after draining
+completions, so killing the tasklet before the source is quiesced leaves
+the same race open.
+
+Once wait_for_stop() returns, no further IRQ-driven scheduling can
+occur. Kill completion_tasklet there so teardown cannot race a queued
+tasklet running on a dead ihost. On remove or unload, the stale callback
+can otherwise dereference ihost and touch ihost->smu_registers after the
+host lifetime ends.
+
+A UML + KASAN analogue reproduced the failure class both with no
+tasklet_kill() and with tasklet_kill() placed before source quiesce, and
+stayed clean once the kill happened after quiescing the scheduling
+source.
+
+This mirrors commit f6ab594672d4 ("scsi: aic94xx: fix use-after-free in
+device removal path"), but ISCI needs the kill after wait_for_stop().
+
+Fixes: 6f231dda6808 ("isci: Intel(R) C600 Series Chipset Storage Control Unit Driver")
+Cc: stable@vger.kernel.org
+Assisted-by: Claude:claude-opus-4-7
+Assisted-by: Codex:gpt-5-4
+Signed-off-by: Michael Bommarito <michael.bommarito@gmail.com>
+Link: https://patch.msgid.link/20260419210420.2134639-1-michael.bommarito@gmail.com
+Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/scsi/isci/host.c | 3 +++
+ 1 file changed, 3 insertions(+)
+
+--- a/drivers/scsi/isci/host.c
++++ b/drivers/scsi/isci/host.c
+@@ -1252,6 +1252,9 @@ void isci_host_deinit(struct isci_host *
+
+ wait_for_stop(ihost);
+
++ /* No further IRQ-driven scheduling can happen past wait_for_stop(). */
++ tasklet_kill(&ihost->completion_tasklet);
++
+ /* phy stop is after controller stop to allow port and device to
+ * go idle before shutting down the phys, but the expectation is
+ * that i/o has been shut off well before we reach this
ixgbevf-fix-use-after-free-in-vepa-multicast-source-pruning.patch
ice-fix-setting-promisc-mode-while-adding-vid-filter.patch
wifi-cfg80211-advance-loop-vars-in-cfg80211_merge_profile.patch
+cifs-fix-busy-dentry-used-after-unmounting.patch
+tracing-do-not-call-map-ops-elt_free-if-elt_alloc-fails.patch
+kvm-arm64-vgic-its-reject-restored-dte-with-out-of-range-num_eventid_bits.patch
+hwmon-pmbus-adm1266-serialize-nvmem-blackbox-read-with-pmbus_lock.patch
+drm-bridge-chipone-icn6211-use-devm_drm_bridge_add-in-i2c-probe.patch
+scsi-isci-fix-use-after-free-in-device-removal-path.patch
+spi-sprd-fix-error-pointer-deref-after-dma-setup-failure.patch
+spi-ti-qspi-fix-use-after-free-after-dma-setup-failure.patch
+rdma-siw-reject-mpa-fpdu-length-underflow-before-signed-receive-math.patch
+loongarch-remove-unused-code-to-avoid-build-warning.patch
+device-property-set-fwnode-secondary-to-null-in-fwnode_init.patch
+drm-virtio-use-uninterruptible-resv-lock-for-plane-updates.patch
+drm-bridge-it66121-acquire-reset-gpio-in-probe.patch
+drm-bridge-megachips-remove-bridge-when-irq-request-fails.patch
+drm-amd-display-fix-integer-overflow-in-bios_get_image.patch
+drm-amd-display-validate-gpio-pin-lut-table-size-before-iterating.patch
+drm-amd-display-validate-payload-length-and-link_index-in-dc_process_dmub_aux_transfer_async.patch
+batman-adv-mcast-fix-use-after-free-in-orig_node-rcu-release.patch
+batman-adv-clear-current-gateway-during-teardown.patch
+batman-adv-dat-handle-forward-allocation-error.patch
+batman-adv-fix-fragment-reassembly-length-accounting.patch
+batman-adv-fix-tp_meter-counter-underflow-during-shutdown.patch
+batman-adv-frag-disallow-unicast-fragment-in-fragment.patch
+batman-adv-bla-fix-report_work-leak-on-backbone_gw-purge.patch
+batman-adv-tp_meter-avoid-use-of-uninit-sender-vars.patch
+batman-adv-tt-fix-negative-last_changeset_len.patch
+batman-adv-tt-fix-negative-tt_buff_len.patch
+hwmon-pmbus-adm1266-seed-timestamp-from-the-real-time-clock.patch
+hwmon-pmbus-adm1266-reject-implausible-blackbox-record_count.patch
+hwmon-pmbus-adm1266-include-pec-byte-in-pmbus_block_xfer-read-buffer.patch
+hwmon-pmbus-adm1266-bounce-blackbox-records-through-a-protocol-sized-buffer.patch
+hwmon-pmbus-adm1266-cap-pdio-scan-in-get_multiple-at-adm1266_pdio_nr.patch
+hwmon-pmbus-adm1266-don-t-clobber-gpio-bits-before-pdio-read-in-get_multiple.patch
+hwmon-pmbus-adm1266-register-the-gpio_chip-after-pmbus_do_probe.patch
+hwmon-pmbus-adm1266-register-the-nvmem-device-after-pmbus_do_probe.patch
+hwmon-pmbus-adm1266-reject-short-block-read-responses-in-the-gpio-accessors.patch
+hwmon-pmbus-adm1266-serialize-gpio-pmbus-accesses-with-pmbus_lock.patch
+hwmon-pmbus-adm1266-serialize-sequencer_state-debugfs-read-with-pmbus_lock.patch
--- /dev/null
+From 3d67fffb74267772d461c02c67f1eff893ad547d Mon Sep 17 00:00:00 2001
+From: Johan Hovold <johan@kernel.org>
+Date: Tue, 12 May 2026 09:47:33 +0200
+Subject: spi: sprd: fix error pointer deref after DMA setup failure
+
+From: Johan Hovold <johan@kernel.org>
+
+commit 3d67fffb74267772d461c02c67f1eff893ad547d upstream.
+
+The driver falls back to PIO mode if DMA setup fails during probe.
+
+Make sure to check the dma.enabled flag before trying to release the DMA
+channels also on late probe errors to avoid dereferencing an error
+pointer (or attempting to release a channel a second time).
+
+This issue was flagged by Sashiko when reviewing a devres allocation
+conversion patch.
+
+Fixes: 386119bc7be9 ("spi: sprd: spi: sprd: Add DMA mode support")
+Link: https://sashiko.dev/#/patchset/20260505072909.618363-1-johan%40kernel.org?part=10
+Cc: stable@vger.kernel.org # 5.1
+Cc: Lanqing Liu <lanqing.liu@unisoc.com>
+Signed-off-by: Johan Hovold <johan@kernel.org>
+Link: https://patch.msgid.link/20260512074733.915029-1-johan@kernel.org
+Signed-off-by: Mark Brown <broonie@kernel.org>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/spi/spi-sprd.c | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+--- a/drivers/spi/spi-sprd.c
++++ b/drivers/spi/spi-sprd.c
+@@ -995,7 +995,8 @@ err_rpm_put:
+ disable_clk:
+ clk_disable_unprepare(ss->clk);
+ release_dma:
+- sprd_spi_dma_release(ss);
++ if (ss->dma.enable)
++ sprd_spi_dma_release(ss);
+ free_controller:
+ spi_controller_put(sctlr);
+
--- /dev/null
+From ea6ec3343e05f7937a53eb6d7617b3abdb4abc19 Mon Sep 17 00:00:00 2001
+From: Johan Hovold <johan@kernel.org>
+Date: Tue, 12 May 2026 09:48:09 +0200
+Subject: spi: ti-qspi: fix use-after-free after DMA setup failure
+
+From: Johan Hovold <johan@kernel.org>
+
+commit ea6ec3343e05f7937a53eb6d7617b3abdb4abc19 upstream.
+
+The driver falls back to PIO mode if DMA setup fails during probe.
+
+Make sure to clear the DMA channel pointer also if buffer allocation
+fails to avoid passing a pointer to the released channel to the DMA
+engine (or trying to free the channel a second time on late probe errors
+or driver unbind).
+
+This issue was flagged by Sashiko when reviewing a devres allocation
+conversion patch.
+
+Fixes: c687c46e9e45 ("spi: spi-ti-qspi: Use bounce buffer if read buffer is not DMA'ble")
+Link: https://sashiko.dev/#/patchset/20260505072909.618363-1-johan%40kernel.org?part=17
+Cc: stable@vger.kernel.org # 4.12
+Cc: Vignesh R <vigneshr@ti.com>
+Signed-off-by: Johan Hovold <johan@kernel.org>
+Link: https://patch.msgid.link/20260512074809.915084-1-johan@kernel.org
+Signed-off-by: Mark Brown <broonie@kernel.org>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/spi/spi-ti-qspi.c | 1 +
+ 1 file changed, 1 insertion(+)
+
+--- a/drivers/spi/spi-ti-qspi.c
++++ b/drivers/spi/spi-ti-qspi.c
+@@ -875,6 +875,7 @@ static int ti_qspi_probe(struct platform
+ dev_err(qspi->dev,
+ "dma_alloc_coherent failed, using PIO mode\n");
+ dma_release_channel(qspi->rx_chan);
++ qspi->rx_chan = NULL;
+ goto no_dma;
+ }
+ master->dma_rx = qspi->rx_chan;
--- /dev/null
+From 8f0f5c4fb9df0e19a341e0c6ed8dc4fda9124f03 Mon Sep 17 00:00:00 2001
+From: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>
+Date: Thu, 21 May 2026 13:49:14 +0900
+Subject: tracing: Do not call map->ops->elt_free() if elt_alloc() fails
+
+From: Masami Hiramatsu (Google) <mhiramat@kernel.org>
+
+commit 8f0f5c4fb9df0e19a341e0c6ed8dc4fda9124f03 upstream.
+
+In paths where tracing_map_elt_alloc() failed to allocate objects,
+the map->ops->elt_alloc() call was never successful. In this case,
+map->ops->elt_free() should not be called.
+
+Link: https://sashiko.dev/#/patchset/20260520223101.34710-1-rosenp%40gmail.com
+
+Cc: stable@vger.kernel.org
+Cc: Tom Zanussi <tom.zanussi@linux.intel.com>
+Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+Cc: Rosen Penev <rosenp@gmail.com>
+Reported-by: Sashiko <sashiko-bot@kernel.org>
+Fixes: 2734b629525a ("tracing: Add per-element variable support to tracing_map")
+Link: https://patch.msgid.link/177933895460.108746.5396070821443932634.stgit@devnote2
+Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
+Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ kernel/trace/tracing_map.c | 17 +++++++++++++----
+ 1 file changed, 13 insertions(+), 4 deletions(-)
+
+--- a/kernel/trace/tracing_map.c
++++ b/kernel/trace/tracing_map.c
+@@ -386,13 +386,11 @@ static void tracing_map_elt_init_fields(
+ }
+ }
+
+-static void tracing_map_elt_free(struct tracing_map_elt *elt)
++static void __tracing_map_elt_free(struct tracing_map_elt *elt)
+ {
+ if (!elt)
+ return;
+
+- if (elt->map->ops && elt->map->ops->elt_free)
+- elt->map->ops->elt_free(elt);
+ kfree(elt->fields);
+ kfree(elt->vars);
+ kfree(elt->var_set);
+@@ -400,6 +398,17 @@ static void tracing_map_elt_free(struct
+ kfree(elt);
+ }
+
++static void tracing_map_elt_free(struct tracing_map_elt *elt)
++{
++ if (!elt)
++ return;
++
++ /* Only objects initialized with alloc_elt() should be passed to free_elt().*/
++ if (elt->map->ops && elt->map->ops->elt_free)
++ elt->map->ops->elt_free(elt);
++ __tracing_map_elt_free(elt);
++}
++
+ static struct tracing_map_elt *tracing_map_elt_alloc(struct tracing_map *map)
+ {
+ struct tracing_map_elt *elt;
+@@ -444,7 +453,7 @@ static struct tracing_map_elt *tracing_m
+ }
+ return elt;
+ free:
+- tracing_map_elt_free(elt);
++ __tracing_map_elt_free(elt);
+
+ return ERR_PTR(err);
+ }
projects / thirdparty / kernel / stable-queue.git / commitdiff
