From 800416f799e0723635ac2d720ad4449917a1481c Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Wed, 27 Oct 2010 19:33:43 +0200 Subject: [PATCH] numa: fix slab_node(MPOL_BIND) 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 Cc: Mel Gorman Cc: Christoph Lameter Cc: Lee Schermerhorn Cc: Andrew Morton Cc: stable@kernel.org Signed-off-by: Linus Torvalds --- mm/mempolicy.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 81a127643aea..4a57f135b76e 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -1597,7 +1597,7 @@ 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: -- 2.20.1