releases/2.6.36.2/numa-fix-slab_node-mpol_bind.patch

   1 From 800416f799e0723635ac2d720ad4449917a1481c Mon Sep 17 00:00:00 2001
   2 From: Eric Dumazet <eric.dumazet@gmail.com>
   3 Date: Wed, 27 Oct 2010 19:33:43 +0200
   4 Subject: numa: fix slab_node(MPOL_BIND)
   5
   6 From: Eric Dumazet <eric.dumazet@gmail.com>
   7
   8 commit 800416f799e0723635ac2d720ad4449917a1481c upstream.
   9
  10 When a node contains only HighMem memory, slab_node(MPOL_BIND)
  11 dereferences a NULL pointer.
  12
  13 [ This code seems to go back all the way to commit 19770b32609b: "mm:
  14   filter based on a nodemask as well as a gfp_mask".  Which was back in
  15   April 2008, and it got merged into 2.6.26.  - Linus ]
  16
  17 Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
  18 Cc: Mel Gorman <mel@csn.ul.ie>
  19 Cc: Christoph Lameter <cl@linux.com>
  20 Cc: Lee Schermerhorn <lee.schermerhorn@hp.com>
  21 Cc: Andrew Morton <akpm@linux-foundation.org>
  22 Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
  23 Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
  24
  25 ---
  26  mm/mempolicy.c |    2 +-
  27  1 file changed, 1 insertion(+), 1 deletion(-)
  28
  29 --- a/mm/mempolicy.c
  30 +++ b/mm/mempolicy.c
  31 @@ -1588,7 +1588,7 @@ unsigned slab_node(struct mempolicy *pol
  32                 (void)first_zones_zonelist(zonelist, highest_zoneidx,
  33                                                         &policy->v.nodes,
  34                                                         &zone);
  35 -               return zone->node;
  36 +               return zone ? zone->node : numa_node_id();
  37         }
  38
  39         default: