From: Christoph Lameter <clameter@sgi.com>
Date: Tue, 11 Apr 2006 05:52:47 +0000 (-0700)
Subject: [PATCH] Fix NULL pointer dereference in node_read_numastat()
X-Git-Tag: v2.6.17-rc2~274
X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=54404e72cd3758e465fb6362f6d71e22b705c589;p=linux-2.6-omap-h63xx.git

[PATCH] 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: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/drivers/base/node.c b/drivers/base/node.c
index 16c513aa4d4..c80c3aeed00 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -106,7 +106,7 @@ static ssize_t node_read_numastat(struct sys_device * dev, char * buf)
 	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;