From: Mike Galbraith <efault@gmx.de>
Date: Wed, 11 Feb 2009 09:53:37 +0000 (+0100)
Subject: perfcounters: fix use after free in perf_release()
X-Git-Tag: v2.6.31-rc1~383^2~511
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5af759176cc767e7426f89764bde4996ebaaf419;p=pandora-kernel.git

perfcounters: fix use after free in perf_release()

running...

  while true; do
    foo -d 1 -f 1 -c 100000 & sleep 1
    kerneltop -d 1 -f 1 -e 1 -c 25000 -p `pidof foo`
  done

  while true; do
    killall foo; killall kerneltop; sleep 2
  done

...in two shells with SLUB_DEBUG enabled produces flood of:
BUG task_struct: Poison overwritten.

Fix the use-after-free bug in perf_release().

Signed-off-by: Mike Galbraith <efault@gmx.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

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