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@gmail.com>
Signed-off-by: Christoph Lameter <clameter@sgi.com>

diff --git a/mm/slub.c b/mm/slub.c
index ecacacdce9d7050faa2598e49d1e2992dc70507d..0863fd38a5ce06a87392f5ba753606a516a5d262 100644 (file)
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -3564,8 +3564,8 @@ enum slab_stat_type {
 #define SO_CPU         (1 << SL_CPU)
 #define SO_OBJECTS     (1 << SL_OBJECTS)
 
-static unsigned long show_slab_objects(struct kmem_cache *s,
-                       char *buf, unsigned long flags)
+static ssize_t show_slab_objects(struct kmem_cache *s,
+                           char *buf, unsigned long flags)
 {
        unsigned long total = 0;
        int cpu;
@@ -3575,6 +3575,8 @@ static unsigned long show_slab_objects(struct kmem_cache *s,
        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) {