netdev - Re: [PATCH net] tcp: fix various issues for sockets morphing to listen state

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Date:   Tue, 07 Mar 2017 13:59:20 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     eric.dumazet@...il.com
Cc:     edumazet@...gle.com, dvyukov@...gle.com, netdev@...r.kernel.org
Subject: Re: [PATCH net] tcp: fix various issues for sockets morphing to
 listen state

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Fri, 03 Mar 2017 14:08:21 -0800

> From: Eric Dumazet <edumazet@...gle.com>
> 
> Dmitry Vyukov reported a divide by 0 triggered by syzkaller, exploiting
> tcp_disconnect() path that was never really considered and/or used
> before syzkaller ;)
> 
> I was not able to reproduce the bug, but it seems issues here are the
> three possible actions that assumed they would never trigger on a
> listener.
> 
> 1) tcp_write_timer_handler
> 2) tcp_delack_timer_handler
> 3) MTU reduction
> 
> Only IPv6 MTU reduction was properly testing TCP_CLOSE and TCP_LISTEN
>  states from tcp_v6_mtu_reduced()
> 
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Reported-by: Dmitry Vyukov <dvyukov@...gle.com>

Applied and queued up for -stable.