netdev - Re: [PATCH net] tcp: initialize rcv_mss to TCP_MIN

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Message-Id: <20170521.132547.2153130831461643500.davem@davemloft.net>
Date:   Sun, 21 May 2017 13:25:47 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     weiwan@...gle.com
Cc:     netdev@...r.kernel.org, ycheng@...gle.com, ncardwell@...gle.com,
        edumazet@...gle.com
Subject: Re: [PATCH net] tcp: initialize rcv_mss to TCP_MIN_MSS instead of 0

From: Wei Wang <weiwan@...gle.com>
Date: Thu, 18 May 2017 11:22:33 -0700

> From: Wei Wang <weiwan@...gle.com>
> 
> When tcp_disconnect() is called, inet_csk_delack_init() sets
> icsk->icsk_ack.rcv_mss to 0.
> This could potentially cause tcp_recvmsg() => tcp_cleanup_rbuf() =>
> __tcp_select_window() call path to have division by 0 issue.
> So this patch initializes rcv_mss to TCP_MIN_MSS instead of 0.
> 
> Reported-by: Andrey Konovalov  <andreyknvl@...gle.com>
> Signed-off-by: Wei Wang <weiwan@...gle.com>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Signed-off-by: Neal Cardwell <ncardwell@...gle.com>
> Signed-off-by: Yuchung Cheng <ycheng@...gle.com>

Applied, thanks.