From: Greg Kroah-Hartman Date: Fri, 3 Feb 2023 09:54:10 +0000 (+0100) Subject: 5.10-stable patches X-Git-Tag: v4.14.305~9 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=043e09a0e287138ad29b551c42a470c314addf50;p=thirdparty%2Fkernel%2Fstable-queue.git 5.10-stable patches added patches: net-fix-null-pointer-in-skb_segment_list.patch --- diff --git a/queue-5.10/net-fix-null-pointer-in-skb_segment_list.patch b/queue-5.10/net-fix-null-pointer-in-skb_segment_list.patch new file mode 100644 index 00000000000..79d55a869a4 --- /dev/null +++ b/queue-5.10/net-fix-null-pointer-in-skb_segment_list.patch @@ -0,0 +1,76 @@ +From 876e8ca8366735a604bac86ff7e2732fc9d85d2d Mon Sep 17 00:00:00 2001 +From: Yan Zhai +Date: Mon, 30 Jan 2023 12:51:48 -0800 +Subject: net: fix NULL pointer in skb_segment_list + +From: Yan Zhai + +commit 876e8ca8366735a604bac86ff7e2732fc9d85d2d upstream. + +Commit 3a1296a38d0c ("net: Support GRO/GSO fraglist chaining.") +introduced UDP listifyed GRO. The segmentation relies on frag_list being +untouched when passing through the network stack. This assumption can be +broken sometimes, where frag_list itself gets pulled into linear area, +leaving frag_list being NULL. When this happens it can trigger +following NULL pointer dereference, and panic the kernel. Reverse the +test condition should fix it. + +[19185.577801][ C1] BUG: kernel NULL pointer dereference, address: +... +[19185.663775][ C1] RIP: 0010:skb_segment_list+0x1cc/0x390 +... +[19185.834644][ C1] Call Trace: +[19185.841730][ C1] +[19185.848563][ C1] __udp_gso_segment+0x33e/0x510 +[19185.857370][ C1] inet_gso_segment+0x15b/0x3e0 +[19185.866059][ C1] skb_mac_gso_segment+0x97/0x110 +[19185.874939][ C1] __skb_gso_segment+0xb2/0x160 +[19185.883646][ C1] udp_queue_rcv_skb+0xc3/0x1d0 +[19185.892319][ C1] udp_unicast_rcv_skb+0x75/0x90 +[19185.900979][ C1] ip_protocol_deliver_rcu+0xd2/0x200 +[19185.910003][ C1] ip_local_deliver_finish+0x44/0x60 +[19185.918757][ C1] __netif_receive_skb_one_core+0x8b/0xa0 +[19185.927834][ C1] process_backlog+0x88/0x130 +[19185.935840][ C1] __napi_poll+0x27/0x150 +[19185.943447][ C1] net_rx_action+0x27e/0x5f0 +[19185.951331][ C1] ? mlx5_cq_tasklet_cb+0x70/0x160 [mlx5_core] +[19185.960848][ C1] __do_softirq+0xbc/0x25d +[19185.968607][ C1] irq_exit_rcu+0x83/0xb0 +[19185.976247][ C1] common_interrupt+0x43/0xa0 +[19185.984235][ C1] asm_common_interrupt+0x22/0x40 +... +[19186.094106][ C1] + +Fixes: 3a1296a38d0c ("net: Support GRO/GSO fraglist chaining.") +Suggested-by: Daniel Borkmann +Reviewed-by: Willem de Bruijn +Signed-off-by: Yan Zhai +Acked-by: Daniel Borkmann +Link: https://lore.kernel.org/r/Y9gt5EUizK1UImEP@debian +Signed-off-by: Jakub Kicinski +Signed-off-by: Greg Kroah-Hartman +--- + net/core/skbuff.c | 5 ++--- + 1 file changed, 2 insertions(+), 3 deletions(-) + +--- a/net/core/skbuff.c ++++ b/net/core/skbuff.c +@@ -3688,7 +3688,7 @@ struct sk_buff *skb_segment_list(struct + + skb_shinfo(skb)->frag_list = NULL; + +- do { ++ while (list_skb) { + nskb = list_skb; + list_skb = list_skb->next; + +@@ -3732,8 +3732,7 @@ struct sk_buff *skb_segment_list(struct + if (skb_needs_linearize(nskb, features) && + __skb_linearize(nskb)) + goto err_linearize; +- +- } while (list_skb); ++ } + + skb->truesize = skb->truesize - delta_truesize; + skb->data_len = skb->data_len - delta_len; diff --git a/queue-5.10/series b/queue-5.10/series index 4156e9aec35..380ac8483b9 100644 --- a/queue-5.10/series +++ b/queue-5.10/series @@ -6,3 +6,4 @@ blk-cgroup-fix-missing-pd_online_fn-while-activating.patch dmaengine-imx-sdma-fix-a-possible-memory-leak-in-sdm.patch acpi-processor-idle-practically-limit-dummy-wait-workaround-to-old-intel-systems.patch bluetooth-fix-null-ptr-deref-on-hci_sync_conn_complete_evt.patch +net-fix-null-pointer-in-skb_segment_list.patch