From: Li Zefan <lizf@cn.fujitsu.com>
Date: Wed, 18 Feb 2009 22:48:20 +0000 (-0800)
Subject: cgroups: fix possible use after free
X-Git-Tag: v2.6.29-rc6~60
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=67e055d144c5b2acdc1c63811fde031263bf92c5;p=pandora-kernel.git

cgroups: fix possible use after free

In cgroup_kill_sb(), root is freed before sb is detached from the list, so
another sget() may find this sb and call cgroup_test_super(), which will
access the root that has been freed.

Reported-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Paul Menage <menage@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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