[PATCH] check return value of kmalloc() in setup_cpu_cache()

[Akinobu Mita <mita@miraclelinux.com>]

This patch makes crash happen when allocation of cpucache data fails
in setup_cpu_cache(). It is a bit better than getting kernel NULL
pointer dereference later.

CC: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Akinobu Mita <mita@miraclelinux.com>

 mm/slab.c |    1 +
 1 file changed, 1 insertion(+)

Index: work-failmalloc/mm/slab.c
===================================================================
--- work-failmalloc.orig/mm/slab.c
+++ work-failmalloc/mm/slab.c
@@ -1932,6 +1932,7 @@ static void setup_cpu_cache(struct kmem_
 	} else {
 		cachep->array[smp_processor_id()] =
 			kmalloc(sizeof(struct arraycache_init), GFP_KERNEL);
+		BUG_ON(!cachep->array[smp_processor_id()]);
 
 		if (g_cpucache_up == PARTIAL_AC) {
 			set_up_list3s(cachep, SIZE_L3);