From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Wed, 30 Dec 2009 15:00:35 +0000 (+0100)
Subject: perf: Fix NULL deref in inheritance code
X-Git-Tag: v2.6.33-rc3~27^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=05cbaa2853cdfc255fdd04e65a82bfe9208c4e52;p=pandora-kernel.git

perf: Fix NULL deref in inheritance code

Liming found a NULL deref when a task has a perf context but no
counters  when it forks.

This can occur in two cases, a race during construction where
the fork hits after installing the context but before the first
counter gets inserted, or more reproducably, a fork after the
last counter is closed (which leaves the context around).

Reported-by: Wang Liming <liming.wang@windriver.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
CC: <stable@kernel.org>
LKML-Reference: <1262185684.7135.222.camel@laptop>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

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