[PATCH] Check the node argument passed to cpumask_of_node

[David John]

Ensure that the node value is valid.

Signed-off-by: David John <davidjon@xxxxxxxxxxx>

diff --git a/arch/x86/include/asm/topology.h b/arch/x86/include/asm/topology.h
index c5087d7..1141a6e 100644
--- a/arch/x86/include/asm/topology.h
+++ b/arch/x86/include/asm/topology.h
@@ -99,7 +99,8 @@ extern const struct cpumask *cpumask_of_node(int node);
 /* Returns a pointer to the cpumask of CPUs on Node 'node'. */
 static inline const struct cpumask *cpumask_of_node(int node)
 {
-	return node_to_cpumask_map[node];
+	return (node < 0 || node >= nr_node_ids) ? cpu_online_mask :
+						   node_to_cpumask_map[node];
 }
 #endif
 
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