From: Christoph Lameter <cl@linux.com>
Date: Wed, 23 Jan 2013 21:45:47 +0000 (+0000)
Subject: slub: Do not dereference NULL pointer in node_match
X-Git-Tag: omap-for-v3.10/dt-fixes-for-merge-window~15^2^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4d7868e6475d478172581828021bd8a356726679;p=pandora-kernel.git

slub: Do not dereference NULL pointer in node_match

The variables accessed in slab_alloc are volatile and therefore
the page pointer passed to node_match can be NULL. The processing
of data in slab_alloc is tentative until either the cmpxhchg
succeeds or the __slab_alloc slowpath is invoked. Both are
able to perform the same allocation from the freelist.

Check for the NULL pointer in node_match.

A false positive will lead to a retry of the loop in __slab_alloc.

Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
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