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

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Date:	Wed, 03 Nov 2010 13:25:03 +0800
From:	Xiaotian Feng <dfeng@...hat.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	"Pekka Savola (ipv6)" <pekkas@...core.fi>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>
Subject: Re: [PATCH] net dst: fix percpu_counter list corruption and poison
 overwritten

On 11/03/2010 01:22 PM, Eric Dumazet wrote:
> 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>
>> Cc: "David S. Miller"<davem@...emloft.net>
>> Cc: Alexey Kuznetsov<kuznet@....inr.ac.ru>
>> Cc: "Pekka Savola (ipv6)"<pekkas@...core.fi>
>> Cc: James Morris<jmorris@...ei.org>
>> Cc: Hideaki YOSHIFUJI<yoshfuji@...ux-ipv6.org>
>> Cc: Patrick McHardy<kaber@...sh.net>
>> ---
>
> Good catch, thanks !
>
> Any reason you didnt Cc me (the author of the patch) ?
Sorry, I just used get_maintainer.pl to get the cc list...
>
> Acked-by: Eric Dumazet<eric.dumazet@...il.com>
>
>
>
>

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