Subject: Re: [PATCH net-next] net: fix uninit-value in caif_seqpkt_sendmsg

From: [email-masked]
Date: Thu, 15 Jul 2021 18:20:04 +0000

Hello:

This patch was applied to netdev/net.git (refs/heads/master):

On Thu, 15 Jul 2021 20:22:04 +0800 you wrote:
> When nr_segs equal to zero in iovec_from_user, the object
> msg->msg_iter.iov is uninit stack memory in caif_seqpkt_sendmsg
> which is defined in ___sys_sendmsg. So we cann't just judge
> msg->msg_iter.iov->base directlly. We can use nr_segs to judge
> msg in caif_seqpkt_sendmsg whether has data buffers.
> 
> =====================================================
> BUG: KMSAN: uninit-value in caif_seqpkt_sendmsg+0x693/0xf60 net/caif/caif_socket.c:542
> Call Trace:
>  __dump_stack lib/dump_stack.c:77 [inline]
>  dump_stack+0x1c9/0x220 lib/dump_stack.c:118
>  kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:118
>  __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215
>  caif_seqpkt_sendmsg+0x693/0xf60 net/caif/caif_socket.c:542
>  sock_sendmsg_nosec net/socket.c:652 [inline]
>  sock_sendmsg net/socket.c:672 [inline]
>  ____sys_sendmsg+0x12b6/0x1350 net/socket.c:2343
>  ___sys_sendmsg net/socket.c:2397 [inline]
>  __sys_sendmmsg+0x808/0xc90 net/socket.c:2480
>  __compat_sys_sendmmsg net/compat.c:656 [inline]
> 
> [...]

Here is the summary with links:
  - [net-next] net: fix uninit-value in caif_seqpkt_sendmsg
    https://git.kernel.org/netdev/net/c/991e634360f2

You are awesome, thank you!
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