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

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Message-ID: <1288761773.2467.535.camel@edumazet-laptop>
Date:	Wed, 03 Nov 2010 06:22:53 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Xiaotian Feng <dfeng@...hat.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

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) ?

Acked-by: Eric Dumazet <eric.dumazet@...il.com>



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