netdev - Re: [net PATCH V2] net: fix divide by zero in tcp algorithm illinois

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Message-Id: <20121101.115629.370549613464282212.davem@davemloft.net>
Date:	Thu, 01 Nov 2012 11:56:29 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	brouer@...hat.com, netdev@...r.kernel.org, pmatouse@...hat.com,
	shemminger@...tta.com
Subject: Re: [net PATCH V2] net: fix divide by zero in tcp algorithm
 illinois

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Wed, 31 Oct 2012 18:14:38 +0100

> On Wed, 2012-10-31 at 13:45 +0100, Jesper Dangaard Brouer wrote:
>> Reading TCP stats when using TCP Illinois congestion control algorithm
>> can cause a divide by zero kernel oops.
>> 
>> The division by zero occur in tcp_illinois_info() at:
>>  do_div(t, ca->cnt_rtt);
>> where ca->cnt_rtt can become zero (when rtt_reset is called)
>> 
> 
>> Cc: Petr Matousek <pmatouse@...hat.com>
>> Signed-off-by: Jesper Dangaard Brouer <brouer@...hat.com>
>> 
>> ---
> 
> Acked-by: Eric Dumazet <edumazet@...gle.com>

Applied, thanks everyone.
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