From 4f8219875a0dad2cfad9e93a3fafcd9626db98d2 Mon Sep 17 00:00:00 2001
From: Mike Galbraith <efault@gmx.de>
Date: Thu, 16 Dec 2010 15:09:52 +0100
Subject: [PATCH] sched, autogroup: Fix potential access to freed memory

Oleg pointed out that the /proc interface kref_get() useage may race with
the final put during autogroup_move_group().  A signal->autogroup assignment
may be in flight when the /proc interface dereference, leaving them taking
a reference to an already dead group.

Reported-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Mike Galbraith <efault@gmx.de>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1292508592.5940.28.camel@maggy.simson.net>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Reading git-format-patch failed