6.19-stable patches

added patches:
	wifi-virt_wifi-remove-set_netdev_dev-to-avoid-use-after-free.patch

diff --git a/queue-6.19/series b/queue-6.19/series
index da733d043e7d98ad01e39d57404bd22a95c36689..c0616f88869769498fb083c6872de1fbb6752927 100644 (file)
--- a/queue-6.19/series
+++ b/queue-6.19/series
@@ -308,3 +308,4 @@ kallsyms-clean-up-namebuf-initialization-in-kallsyms_lookup_buildid.patch
 kallsyms-clean-up-modname-and-modbuildid-initialization-in-kallsyms_lookup_buildid.patch
 kallsyms-cleanup-code-for-appending-the-module-buildid.patch
 kallsyms-prevent-module-removal-when-printing-module-name-and-buildid.patch
+wifi-virt_wifi-remove-set_netdev_dev-to-avoid-use-after-free.patch

diff --git a/queue-6.19/wifi-virt_wifi-remove-set_netdev_dev-to-avoid-use-after-free.patch b/queue-6.19/wifi-virt_wifi-remove-set_netdev_dev-to-avoid-use-after-free.patch
new file mode 100644 (file)
index 0000000..4bb2357
--- /dev/null
+++ b/queue-6.19/wifi-virt_wifi-remove-set_netdev_dev-to-avoid-use-after-free.patch
@@ -0,0 +1,101 @@
+From 789b06f9f39cdc7e895bdab2c034e39c41c8f8d6 Mon Sep 17 00:00:00 2001
+From: Alexander Popov <alex.popov@linux.com>
+Date: Wed, 25 Mar 2026 01:46:02 +0300
+Subject: wifi: virt_wifi: remove SET_NETDEV_DEV to avoid use-after-free
+
+From: Alexander Popov <alex.popov@linux.com>
+
+commit 789b06f9f39cdc7e895bdab2c034e39c41c8f8d6 upstream.
+
+Currently we execute `SET_NETDEV_DEV(dev, &priv->lowerdev->dev)` for
+the virt_wifi net devices. However, unregistering a virt_wifi device in
+netdev_run_todo() can happen together with the device referenced by
+SET_NETDEV_DEV().
+
+It can result in use-after-free during the ethtool operations performed
+on a virt_wifi device that is currently being unregistered. Such a net
+device can have the `dev.parent` field pointing to the freed memory,
+but ethnl_ops_begin() calls `pm_runtime_get_sync(dev->dev.parent)`.
+
+Let's remove SET_NETDEV_DEV for virt_wifi to avoid bugs like this:
+
+ ==================================================================
+ BUG: KASAN: slab-use-after-free in __pm_runtime_resume+0xe2/0xf0
+ Read of size 2 at addr ffff88810cfc46f8 by task pm/606
+
+ Call Trace:
+  <TASK>
+  dump_stack_lvl+0x4d/0x70
+  print_report+0x170/0x4f3
+  ? __pfx__raw_spin_lock_irqsave+0x10/0x10
+  kasan_report+0xda/0x110
+  ? __pm_runtime_resume+0xe2/0xf0
+  ? __pm_runtime_resume+0xe2/0xf0
+  __pm_runtime_resume+0xe2/0xf0
+  ethnl_ops_begin+0x49/0x270
+  ethnl_set_features+0x23c/0xab0
+  ? __pfx_ethnl_set_features+0x10/0x10
+  ? kvm_sched_clock_read+0x11/0x20
+  ? local_clock_noinstr+0xf/0xf0
+  ? local_clock+0x10/0x30
+  ? kasan_save_track+0x25/0x60
+  ? __kasan_kmalloc+0x7f/0x90
+  ? genl_family_rcv_msg_attrs_parse.isra.0+0x150/0x2c0
+  genl_family_rcv_msg_doit+0x1e7/0x2c0
+  ? __pfx_genl_family_rcv_msg_doit+0x10/0x10
+  ? __pfx_cred_has_capability.isra.0+0x10/0x10
+  ? stack_trace_save+0x8e/0xc0
+  genl_rcv_msg+0x411/0x660
+  ? __pfx_genl_rcv_msg+0x10/0x10
+  ? __pfx_ethnl_set_features+0x10/0x10
+  netlink_rcv_skb+0x121/0x380
+  ? __pfx_genl_rcv_msg+0x10/0x10
+  ? __pfx_netlink_rcv_skb+0x10/0x10
+  ? __pfx_down_read+0x10/0x10
+  genl_rcv+0x23/0x30
+  netlink_unicast+0x60f/0x830
+  ? __pfx_netlink_unicast+0x10/0x10
+  ? __pfx___alloc_skb+0x10/0x10
+  netlink_sendmsg+0x6ea/0xbc0
+  ? __pfx_netlink_sendmsg+0x10/0x10
+  ? __futex_queue+0x10b/0x1f0
+  ____sys_sendmsg+0x7a2/0x950
+  ? copy_msghdr_from_user+0x26b/0x430
+  ? __pfx_____sys_sendmsg+0x10/0x10
+  ? __pfx_copy_msghdr_from_user+0x10/0x10
+  ___sys_sendmsg+0xf8/0x180
+  ? __pfx____sys_sendmsg+0x10/0x10
+  ? __pfx_futex_wait+0x10/0x10
+  ? fdget+0x2e4/0x4a0
+  __sys_sendmsg+0x11f/0x1c0
+  ? __pfx___sys_sendmsg+0x10/0x10
+  do_syscall_64+0xe2/0x570
+  ? exc_page_fault+0x66/0xb0
+  entry_SYSCALL_64_after_hwframe+0x77/0x7f
+  </TASK>
+
+This fix may be combined with another one in the ethtool subsystem:
+https://lore.kernel.org/all/20260322075917.254874-1-alex.popov@linux.com/T/#u
+
+Fixes: d43c65b05b848e0b ("ethtool: runtime-resume netdev parent in ethnl_ops_begin")
+Cc: stable@vger.kernel.org
+Signed-off-by: Alexander Popov <alex.popov@linux.com>
+Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+Reviewed-by: Breno Leitao <leitao@debian.org>
+Link: https://patch.msgid.link/20260324224607.374327-1-alex.popov@linux.com
+Signed-off-by: Johannes Berg <johannes.berg@intel.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/net/wireless/virtual/virt_wifi.c |    1 -
+ 1 file changed, 1 deletion(-)
+
+--- a/drivers/net/wireless/virtual/virt_wifi.c
++++ b/drivers/net/wireless/virtual/virt_wifi.c
+@@ -557,7 +557,6 @@ static int virt_wifi_newlink(struct net_
+       eth_hw_addr_inherit(dev, priv->lowerdev);
+       netif_stacked_transfer_operstate(priv->lowerdev, dev);
+ 
+-      SET_NETDEV_DEV(dev, &priv->lowerdev->dev);
+       dev->ieee80211_ptr = kzalloc(sizeof(*dev->ieee80211_ptr), GFP_KERNEL);
+ 
+       if (!dev->ieee80211_ptr) {