linux-kernel - Re: [PATCH] net dst: fix percpu_counter list corruption and poison overwritten

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Message-Id: <20101103.185914.245411332.davem@davemloft.net>
Date:	Wed, 03 Nov 2010 18:59:14 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	dfeng@...hat.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, kuznet@....inr.ac.ru,
	pekkas@...core.fi, jmorris@...ei.org, yoshfuji@...ux-ipv6.org,
	kaber@...sh.net
Subject: Re: [PATCH] net dst: fix percpu_counter list corruption and poison
 overwritten

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Wed, 03 Nov 2010 06:22:53 +0100

> Le mercredi 03 novembre 2010 à 10:11 +0800, Xiaotian Feng a écrit :
>> There're some percpu_counter list corruption and poison overwritten warnings
>> in recent kernel, which is resulted by fc66f95c.
>> 
>> commit fc66f95c switches to use percpu_counter, in ip6_route_net_init, kernel
>> init the percpu_counter for dst entries, but, the percpu_counter is never destroyed
>> in ip6_route_net_exit. So if the related data is freed by kernel, the freed percpu_counter
>> is still on the list, then if we insert/remove other percpu_counter, list corruption
>> resulted. Also, if the insert/remove option modifies the ->prev,->next pointer of
>> the freed value, the poison overwritten is resulted then.
>> 
>> With the following patch, the percpu_counter list corruption and poison overwritten
>> warnings disappeared.
>> 
>> Signed-off-by: Xiaotian Feng <dfeng@...hat.com>
 ...
> Acked-by: Eric Dumazet <eric.dumazet@...il.com>

Applied, thanks!
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