linux-kernel - Re: [PATCH 03/12] Revert "memcg: avoid dangling reference count in creation failure."

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Message-ID: <516381DD.8050706@jp.fujitsu.com>
Date:	Tue, 09 Apr 2013 11:50:05 +0900
From:	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Li Zefan <lizefan@...wei.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Tejun Heo <tj@...nel.org>,
	Glauber Costa <glommer@...allels.com>,
	Johannes Weiner <hannes@...xchg.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Cgroups <cgroups@...r.kernel.org>, linux-mm@...ck.org
Subject: Re: [PATCH 03/12] Revert "memcg: avoid dangling reference count in
 creation failure."

(2013/04/08 15:33), Li Zefan wrote:
> From: Michal Hocko <mhocko@...e.cz>
> 
> This reverts commit e4715f01be697a3730c78f8ffffb595591d6a88c
> 
> mem_cgroup_put is hierarchy aware so mem_cgroup_put(memcg) already drops
> an additional reference from all parents so the additional
> mem_cgrroup_put(parent) potentially causes use-after-free.
> 
> Signed-off-by: Li Zefan <lizefan@...wei.com>
> Signed-off-by: Michal Hocko <mhocko@...e.cz>

Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>



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