linux-kernel - [ 066/100] mm/mempolicy.c: fix wrong sp

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Message-Id: <20130312223130.053436431@linuxfoundation.org>
Date:	Tue, 12 Mar 2013 15:31:51 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Hillf Danton <dhillf@...il.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	Hugh Dickins <hughd@...gle.com>, Mel Gorman <mgorman@...e.de>,
	Dave Jones <davej@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [ 066/100] mm/mempolicy.c: fix wrong sp_node insertion

3.8-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Hillf Danton <dhillf@...il.com>

commit 5ca3957510b9fc2a14d3647db518014842f9a2b4 upstream.

n->end is accessed in sp_insert(). Thus it should be update
before calling sp_insert(). This mistake may make kernel panic.

Signed-off-by: Hillf Danton <dhillf@...il.com>
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc: Sasha Levin <sasha.levin@...cle.com>
Cc: Hugh Dickins <hughd@...gle.com>
Cc: Mel Gorman <mgorman@...e.de>
Cc: Dave Jones <davej@...hat.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 mm/mempolicy.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -2386,8 +2386,8 @@ restart:
 				*mpol_new = *n->policy;
 				atomic_set(&mpol_new->refcnt, 1);
 				sp_node_init(n_new, n->end, end, mpol_new);
-				sp_insert(sp, n_new);
 				n->end = start;
+				sp_insert(sp, n_new);
 				n_new = NULL;
 				mpol_new = NULL;
 				break;


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