From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Date: Mon, 12 May 2008 21:02:31 +0000 (-0700)
Subject: memcg: fix possible panic when CONFIG_MM_OWNER=y
X-Git-Tag: v2.6.26-rc3~81
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4cd1a8fc3d3cd740416b14ece2693dbb5d065eaf;p=pandora-kernel.git

memcg: fix possible panic when CONFIG_MM_OWNER=y

When mm destruction happens, we should pass mm_update_next_owner() the old mm.
 But unfortunately new mm is passed in exec_mmap().

Thus, kernel panic is possible when a multi-threaded process uses exec().

Also, the owner member comment description is wrong.  mm->owner does not
necessarily point to the thread group leader.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Acked-by: Balbir Singh <balbir@linux.vnet.ibm.com>
Cc: "Paul Menage" <menage@google.com>
Cc: "KAMEZAWA Hiroyuki" <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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