linux-kernel - [PATCH] slub: fix possible NULL pointer dereference

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Date:	Sun, 2 Mar 2008 23:28:24 +0300
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Christoph Lameter <clameter@....com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Rik van Riel <riel@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH] slub: fix possible NULL pointer dereference

This patch fix possible NULL pointer dereference if kzalloc
failed. To be able to return proper error code the function
return type is changed to ssize_t (according to callees and
sysfs definitions).

Signed-off-by: Cyrill Gorcunov <gorcunov@...il.com>
---

Index: linux-2.6.git/mm/slub.c
===================================================================
--- linux-2.6.git.orig/mm/slub.c	2008-03-02 22:53:27.000000000 +0300
+++ linux-2.6.git/mm/slub.c	2008-03-02 23:02:27.000000000 +0300
@@ -3591,8 +3591,8 @@ enum slab_stat_type {
 #define SO_CPU		(1 << SL_CPU)
 #define SO_OBJECTS	(1 << SL_OBJECTS)
 
-static unsigned long slab_objects(struct kmem_cache *s,
-			char *buf, unsigned long flags)
+static ssize_t slab_objects(struct kmem_cache *s,
+			    char *buf, unsigned long flags)
 {
 	unsigned long total = 0;
 	int cpu;
@@ -3602,6 +3602,8 @@ static unsigned long slab_objects(struct
 	unsigned long *per_cpu;
 
 	nodes = kzalloc(2 * sizeof(unsigned long) * nr_node_ids, GFP_KERNEL);
+	if (!nodes)
+		return -ENOMEM;
 	per_cpu = nodes + nr_node_ids;
 
 	for_each_possible_cpu(cpu) {
--
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