netdev - Re: [PATCH net] tcp: fix 0 divide in __tcp_select

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Message-ID: <CADVnQymvZ4Rvdx3mG=jA_9RMs79O5-r5quroN6Kjzso0WsUvgg@mail.gmail.com>
Date:   Wed, 1 Feb 2017 11:41:49 -0500
From:   Neal Cardwell <ncardwell@...gle.com>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     David Miller <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        Dmitry Vyukov <dvyukov@...gle.com>
Subject: Re: [PATCH net] tcp: fix 0 divide in __tcp_select_window()

On Wed, Feb 1, 2017 at 11:33 AM, Eric Dumazet <eric.dumazet@...il.com> wrote:
>
> From: Eric Dumazet <edumazet@...gle.com>
>
> syszkaller fuzzer was able to trigger a divide by zero, when
> TCP window scaling is not enabled.
>
> SO_RCVBUF can be used not only to increase sk_rcvbuf, also
> to decrease it below current receive buffers utilization.
>
> If mss is negative or 0, just return a zero TCP window.
>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Reported-by: Dmitry Vyukov  <dvyukov@...gle.com>
> ---

Acked-by: Neal Cardwell <ncardwell@...gle.com>

Thanks, Eric!

neal