linux-kernel - Re: [3.1] Divide by zero in __tcp_select

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Message-Id: <20111114.153608.2064552703690099046.davem@davemloft.net>
Date:	Mon, 14 Nov 2011 15:36:08 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	sim@...tway.ca, tglx@...utronix.de, netdev@...r.kernel.org,
	a.p.zijlstra@...llo.nl, linux-kernel@...r.kernel.org,
	davej@...hat.com, schwidefsky@...ibm.com, mingo@...e.hu
Subject: Re: [3.1] Divide by zero in __tcp_select_window()

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Tue, 08 Nov 2011 22:23:25 +0100

> OK, it seems we let a timer running while we free the socket (same error
> path than your previous bug report, because of the NULL route)
> 
> We arm this keepalive timer in tcp_create_openreq_child()
> 
> net/ipv4/tcp_minisocks.c:513
> 	if (sock_flag(newsk, SOCK_KEEPOPEN))
> 		inet_csk_reset_keepalive_timer(newsk,
> 			keepalive_time_when(newtp));
> 
> I would try to add a call to tcp_clear_xmit_timers() as well
> 
> Please try following patch :

We've been waiting quite some time to get some testing validation on
this patch, but I think it's correct.

Eric can you formally submit this?  Thanks!
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