linux-kernel - [PATCH] [68/223] numa: fix slab_node(MPOL

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Date:	Mon, 13 Dec 2010 00:46:06 +0100 (CET)
From:	Andi Kleen <andi@...stfloor.org>
To:	eric.dumazet@...il.com, mel@....ul.ie, cl@...ux.com,
	lee.schermerhorn@...com, akpm@...ux-foundation.org,
	torvalds@...ux-foundation.org, gregkh@...e.de, ak@...ux.intel.com,
	linux-kernel@...r.kernel.org, stable@...nel.org
Subject: [PATCH] [68/223] numa: fix slab_node(MPOL_BIND)

2.6.35-longterm review patch.  If anyone has any objections, please let me know.

------------------
From: Eric Dumazet <eric.dumazet@...il.com>

commit 800416f799e0723635ac2d720ad4449917a1481c upstream.

When a node contains only HighMem memory, slab_node(MPOL_BIND)
dereferences a NULL pointer.

[ This code seems to go back all the way to commit 19770b32609b: "mm:
  filter based on a nodemask as well as a gfp_mask".  Which was back in
  April 2008, and it got merged into 2.6.26.  - Linus ]

Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
Cc: Mel Gorman <mel@....ul.ie>
Cc: Christoph Lameter <cl@...ux.com>
Cc: Lee Schermerhorn <lee.schermerhorn@...com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>

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

Index: linux/mm/mempolicy.c
===================================================================
--- linux.orig/mm/mempolicy.c
+++ linux/mm/mempolicy.c
@@ -1576,7 +1576,7 @@ unsigned slab_node(struct mempolicy *pol
 		(void)first_zones_zonelist(zonelist, highest_zoneidx,
 							&policy->v.nodes,
 							&zone);
-		return zone->node;
+		return zone ? zone->node : numa_node_id();
 	}
 
 	default:
--
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