linux-kernel - [34-longterm 035/209] numa: fix slab_node(MPOL

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Message-Id: <1302803039-9400-36-git-send-email-paul.gortmaker@windriver.com>
Date:	Thu, 14 Apr 2011 13:41:05 -0400
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	stable@...nel.org, linux-kernel@...r.kernel.org
Cc:	stable-review@...nel.org, Eric Dumazet <eric.dumazet@...il.com>,
	Mel Gorman <mel@....ul.ie>, Christoph Lameter <cl@...ux.com>,
	Lee Schermerhorn <lee.schermerhorn@...com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Paul Gortmaker <paul.gortmaker@...driver.com>
Subject: [34-longterm 035/209] numa: fix slab_node(MPOL_BIND)

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

  =====================================================================
  | This is a commit scheduled for the next v2.6.34 longterm release. |
  | If you see a problem with using this for longterm, please comment.|
  =====================================================================

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: Paul Gortmaker <paul.gortmaker@...driver.com>
---
 mm/mempolicy.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 08f40a2..c7f53b12 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -1509,7 +1509,7 @@ unsigned slab_node(struct mempolicy *policy)
 		(void)first_zones_zonelist(zonelist, highest_zoneidx,
 							&policy->v.nodes,
 							&zone);
-		return zone->node;
+		return zone ? zone->node : numa_node_id();
 	}
 
 	default:
-- 
1.7.4.4

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