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numa: fix slab_node(MPOL_BIND)

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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 19770b3260: "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@gmail.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Christoph Lameter <cl@linux.com>
Cc: Lee Schermerhorn <lee.schermerhorn@hp.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Eric Dumazet 2010-10-27 19:33:43 +02:00 committed by Linus Torvalds
parent 0851668fdd
commit 800416f799
1 changed files with 1 additions and 1 deletions
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2
mm/mempolicy.c
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@ -1597,7 +1597,7 @@ unsigned slab_node(struct mempolicy *policy)
(void)first_zones_zonelist(zonelist, highest_zoneidx, (void)first_zones_zonelist(zonelist, highest_zoneidx,
&policy->v.nodes, &policy->v.nodes,
&zone); &zone);
return zone->node; return zone ? zone->node : numa_node_id();
} }
default: default: