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

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Date:	Wed, 31 Oct 2012 18:14:38 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jesper Dangaard Brouer <brouer@...hat.com>
Cc:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	Petr Matousek <pmatouse@...hat.com>,
	Stephen Hemminger <shemminger@...tta.com>
Subject: Re: [net PATCH V2] net: fix divide by zero in tcp algorithm
 illinois

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>


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