From: Takamori Yamaguchi <takamori.yamaguchi@jp.sony.com>
Date: Thu, 8 Nov 2012 23:53:39 +0000 (-0800)
Subject: mm: bugfix: set current->reclaim_state to NULL while returning from kswapd()
X-Git-Tag: v3.2.34~19
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3f2a7f33cab017aaf692a499439b8cd6b8998c7f;p=pandora-kernel.git

mm: bugfix: set current->reclaim_state to NULL while returning from kswapd()

commit b0a8cc58e6b9aaae3045752059e5e6260c0b94bc upstream.

In kswapd(), set current->reclaim_state to NULL before returning, as
current->reclaim_state holds reference to variable on kswapd()'s stack.

In rare cases, while returning from kswapd() during memory offlining,
__free_slab() and freepages() can access the dangling pointer of
current->reclaim_state.

Signed-off-by: Takamori Yamaguchi <takamori.yamaguchi@jp.sony.com>
Signed-off-by: Aaditya Kumar <aaditya.kumar@ap.sony.com>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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