linux-kernel - [BUGFIX][PATCH] memcg: use rcu_dereference to access mm->owner

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Date:	Mon, 13 Apr 2009 15:43:43 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Cc:	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
	"kosaki.motohiro@...fujitsu.com" <kosaki.motohiro@...fujitsu.com>
Subject: [BUGFIX][PATCH]  memcg: use rcu_dereference to access mm->owner

the patch itself is against mmotm-Apr11.
Maybe it's better to apply 2.6.30-rc series.
==
From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

mm->owner should be accessed with rcu_dereference().

Reported-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
---
 include/linux/memcontrol.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: mmotm-2.6.30-Apr11/include/linux/memcontrol.h
===================================================================
--- mmotm-2.6.30-Apr11.orig/include/linux/memcontrol.h
+++ mmotm-2.6.30-Apr11/include/linux/memcontrol.h
@@ -75,7 +75,7 @@ int mm_match_cgroup(const struct mm_stru
 {
 	struct mem_cgroup *mem;
 	rcu_read_lock();
-	mem = mem_cgroup_from_task((mm)->owner);
+	mem = mem_cgroup_from_task(rcu_dereference((mm)->owner));
 	rcu_read_unlock();
 	return cgroup == mem;
 }

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