[patch 21/26] Fix NULL pointer dereference in node_read_numastat()

[gregkh@suse.de]

From: Christoph Lameter <clameter@sgi.com>

Fix NULL pointer dereference in node_read_numastat()

zone_pcp() only returns valid values if the processor is online.

Change node_read_numastat() to only scan online processors.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
 drivers/base/node.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- linux-2.6.16.1.orig/drivers/base/node.c
+++ linux-2.6.16.1/drivers/base/node.c
@@ -106,7 +106,7 @@ static ssize_t node_read_numastat(struct
 	other_node = 0;
 	for (i = 0; i < MAX_NR_ZONES; i++) {
 		struct zone *z = &pg->node_zones[i];
-		for (cpu = 0; cpu < NR_CPUS; cpu++) {
+		for_each_online_cpu(cpu) {
 			struct per_cpu_pageset *ps = zone_pcp(z,cpu);
 			numa_hit += ps->numa_hit;
 			numa_miss += ps->numa_miss;

--
-
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