linux-kernel - Re: [PATCH] memcg: avoid "free" overflow in memcg_hierarchical_free

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Message-Id: <20101116124704.c68288b5.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Tue, 16 Nov 2010 12:47:04 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Greg Thelen <gthelen@...gle.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Johannes Weiner <hannes@...xchg.org>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Minchan Kim <minchan.kim@...il.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] memcg: avoid "free" overflow in
 memcg_hierarchical_free_pages()

On Tue,  9 Nov 2010 00:54:13 -0800
Greg Thelen <gthelen@...gle.com> wrote:

> memcg limit and usage values are stored in res_counter, as 64-bit
> numbers, even on 32-bit machines.  The "free" variable in
> memcg_hierarchical_free_pages() stores the difference between two
> 64-bit numbers (limit - current_usage), and thus should be stored
> in a 64-bit local rather than a machine defined unsigned long.
> 
> Reported-by: Daisuke Nishimura <nishimura@....nes.nec.co.jp>
> Signed-off-by: Greg Thelen <gthelen@...gle.com>

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

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