linux-kernel - Re: [PATCH v2 net] atm: clip: Fix NULL pointer dereference in vcc

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Message-Id: 
 <175211461500.963219.1846450385340315182.git-patchwork-notify@kernel.org>
Date: Thu, 10 Jul 2025 02:30:15 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Yue Haibing <yuehaibing@...wei.com>
Cc: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
 pabeni@...hat.com, horms@...nel.org, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 net] atm: clip: Fix NULL pointer dereference in
 vcc_sendmsg()

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@...nel.org>:

On Sat, 5 Jul 2025 16:52:28 +0800 you wrote:
> atmarpd_dev_ops does not implement the send method, which may cause crash
> as bellow.
> 
> BUG: kernel NULL pointer dereference, address: 0000000000000000
> PGD 0 P4D 0
> Oops: Oops: 0010 [#1] SMP KASAN NOPTI
> CPU: 0 UID: 0 PID: 5324 Comm: syz.0.0 Not tainted 6.15.0-rc6-syzkaller-00346-g5723cc3450bc #0 PREEMPT(full)
> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
> RIP: 0010:0x0
> Code: Unable to access opcode bytes at 0xffffffffffffffd6.
> RSP: 0018:ffffc9000d3cf778 EFLAGS: 00010246
> RAX: 1ffffffff1910dd1 RBX: 00000000000000c0 RCX: dffffc0000000000
> RDX: ffffc9000dc82000 RSI: ffff88803e4c4640 RDI: ffff888052cd0000
> RBP: ffffc9000d3cf8d0 R08: ffff888052c9143f R09: 1ffff1100a592287
> R10: dffffc0000000000 R11: 0000000000000000 R12: 1ffff92001a79f00
> R13: ffff888052cd0000 R14: ffff88803e4c4640 R15: ffffffff8c886e88
> FS:  00007fbc762566c0(0000) GS:ffff88808d6c2000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: ffffffffffffffd6 CR3: 0000000041f1b000 CR4: 0000000000352ef0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
>  <TASK>
>  vcc_sendmsg+0xa10/0xc50 net/atm/common.c:644
>  sock_sendmsg_nosec net/socket.c:712 [inline]
>  __sock_sendmsg+0x219/0x270 net/socket.c:727
>  ____sys_sendmsg+0x52d/0x830 net/socket.c:2566
>  ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2620
>  __sys_sendmmsg+0x227/0x430 net/socket.c:2709
>  __do_sys_sendmmsg net/socket.c:2736 [inline]
>  __se_sys_sendmmsg net/socket.c:2733 [inline]
>  __x64_sys_sendmmsg+0xa0/0xc0 net/socket.c:2733
>  do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
>  do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
>  entry_SYSCALL_64_after_hwframe+0x77/0x7f
> 
> [...]

Here is the summary with links:
  - [v2,net] atm: clip: Fix NULL pointer dereference in vcc_sendmsg()
    https://git.kernel.org/netdev/net/c/22fc46cea91d

You are awesome, thank you!
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