From: Jack Steiner <steiner@sgi.com>
Date: Wed, 17 Jun 2009 23:28:33 +0000 (-0700)
Subject: gru: fix potential use-after-free when purging GRU tlbs
X-Git-Tag: v2.6.31-rc1~150
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1926ee85a903d189c5702eed6531be321e33eb47;p=pandora-kernel.git

gru: fix potential use-after-free when purging GRU tlbs

Fix potential SGI GRU bug that could cause a use-after-free.  If one
thread in a task is flushing the GRU and another thread destroys the GRU
context, there is the potential to access a table after it has been freed.

Copy the gms pointer to a local variable before unlocking the gts table.
Note that no refcnt is needed for the gms - the reference is held
indirectly by the task's mm_struct.

Signed-off-by: Jack Steiner <steiner@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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