From: Peter Zijlstra <peterz@infradead.org>
Date: Wed, 19 Jan 2011 11:26:11 +0000 (+0100)
Subject: sched, cgroup: Use exit hook to avoid use-after-free crash
X-Git-Tag: v2.6.38-rc2~21^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=068c5cc5ac7414a8e9eb7856b4bf3cc4d4744267;p=pandora-kernel.git

sched, cgroup: Use exit hook to avoid use-after-free crash

By not notifying the controller of the on-exit move back to
init_css_set, we fail to move the task out of the previous
cgroup's cfs_rq. This leads to an opportunity for a
cgroup-destroy to come in and free the cgroup (there are no
active tasks left in it after all) to which the not-quite dead
task is still enqueued.

Reported-by: Miklos Vajna <vmiklos@frugalware.org>
Fixed-by: Mike Galbraith <efault@gmx.de>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: <stable@kernel.org>
Cc: Mike Galbraith <efault@gmx.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
LKML-Reference: <1293206353.29444.205.camel@laptop>
---

Reading git-diff-tree failed