netdev - Re: [PATCH net] tcp: fix error recovery in tcp_zerocopy

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Message-Id: <20200514.151311.883516625024833502.davem@davemloft.net>
Date:   Thu, 14 May 2020 15:13:11 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     edumazet@...gle.com
Cc:     netdev@...r.kernel.org, eric.dumazet@...il.com,
        arjunroy@...gle.com, soheil@...gle.com, syzkaller@...glegroups.com
Subject: Re: [PATCH net] tcp: fix error recovery in tcp_zerocopy_receive()

From: Eric Dumazet <edumazet@...gle.com>
Date: Thu, 14 May 2020 13:58:13 -0700

> If user provides wrong virtual address in TCP_ZEROCOPY_RECEIVE
> operation we want to return -EINVAL error.
> 
> But depending on zc->recv_skip_hint content, we might return
> -EIO error if the socket has SOCK_DONE set.
> 
> Make sure to return -EINVAL in this case.
> 
> BUG: KMSAN: uninit-value in tcp_zerocopy_receive net/ipv4/tcp.c:1833 [inline]
  ...
> Fixes: 05255b823a61 ("tcp: add TCP_ZEROCOPY_RECEIVE support for zerocopy receive")
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Reported-by: syzbot <syzkaller@...glegroups.com>

Series applied and queued up for -stable, thanks.