netdev - Re: [PATCH net] ipv6: Fix an uninit variable access bug in __ip6_make

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Date:   Mon, 03 Apr 2023 09:20:19 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Ziyang Xuan <william.xuanziyang@...wei.com>
Cc:     davem@...emloft.net, dsahern@...nel.org, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, dlstevens@...ibm.com
Subject: Re: [PATCH net] ipv6: Fix an uninit variable access bug in
 __ip6_make_skb()

Hello:

This patch was applied to netdev/net.git (main)
by David S. Miller <davem@...emloft.net>:

On Mon, 3 Apr 2023 15:34:17 +0800 you wrote:
> Syzbot reported a bug as following:
> 
> =====================================================
> BUG: KMSAN: uninit-value in arch_atomic64_inc arch/x86/include/asm/atomic64_64.h:88 [inline]
> BUG: KMSAN: uninit-value in arch_atomic_long_inc include/linux/atomic/atomic-long.h:161 [inline]
> BUG: KMSAN: uninit-value in atomic_long_inc include/linux/atomic/atomic-instrumented.h:1429 [inline]
> BUG: KMSAN: uninit-value in __ip6_make_skb+0x2f37/0x30f0 net/ipv6/ip6_output.c:1956
>  arch_atomic64_inc arch/x86/include/asm/atomic64_64.h:88 [inline]
>  arch_atomic_long_inc include/linux/atomic/atomic-long.h:161 [inline]
>  atomic_long_inc include/linux/atomic/atomic-instrumented.h:1429 [inline]
>  __ip6_make_skb+0x2f37/0x30f0 net/ipv6/ip6_output.c:1956
>  ip6_finish_skb include/net/ipv6.h:1122 [inline]
>  ip6_push_pending_frames+0x10e/0x550 net/ipv6/ip6_output.c:1987
>  rawv6_push_pending_frames+0xb12/0xb90 net/ipv6/raw.c:579
>  rawv6_sendmsg+0x297e/0x2e60 net/ipv6/raw.c:922
>  inet_sendmsg+0x101/0x180 net/ipv4/af_inet.c:827
>  sock_sendmsg_nosec net/socket.c:714 [inline]
>  sock_sendmsg net/socket.c:734 [inline]
>  ____sys_sendmsg+0xa8e/0xe70 net/socket.c:2476
>  ___sys_sendmsg+0x2a1/0x3f0 net/socket.c:2530
>  __sys_sendmsg net/socket.c:2559 [inline]
>  __do_sys_sendmsg net/socket.c:2568 [inline]
>  __se_sys_sendmsg net/socket.c:2566 [inline]
>  __x64_sys_sendmsg+0x367/0x540 net/socket.c:2566
>  do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>  do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
>  entry_SYSCALL_64_after_hwframe+0x63/0xcd
> 
> [...]

Here is the summary with links:
  - [net] ipv6: Fix an uninit variable access bug in __ip6_make_skb()
    https://git.kernel.org/netdev/net/c/ea30388baebc

You are awesome, thank you!
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