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authorDan Carpenter <error27@gmail.com>2010-11-11 14:05:12 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2010-11-12 07:55:31 -0800
commitd2e61b8dc99fdb36e0fd176e25365f69afda4ff9 (patch)
tree580325e7a44fc02d985bca17a1d7601e6ed81cb9 /mm
parent1093736b3c34319b8f1825a4423414d9cf397d73 (diff)
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memcg: null dereference on allocation failure
The original code had a null dereference if alloc_percpu() failed. This was introduced in commit 711d3d2c9bc3 ("memcg: cpu hotplug aware percpu count updates") Signed-off-by: Dan Carpenter <error27@gmail.com> Reviewed-by: Balbir Singh <balbir@linux.vnet.ibm.com> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Acked-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/memcontrol.c16
1 files changed, 9 insertions, 7 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 9a99cfaf0a1..2efa8ea07ff 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -4208,15 +4208,17 @@ static struct mem_cgroup *mem_cgroup_alloc(void)
memset(mem, 0, size);
mem->stat = alloc_percpu(struct mem_cgroup_stat_cpu);
- if (!mem->stat) {
- if (size < PAGE_SIZE)
- kfree(mem);
- else
- vfree(mem);
- mem = NULL;
- }
+ if (!mem->stat)
+ goto out_free;
spin_lock_init(&mem->pcp_counter_lock);
return mem;
+
+out_free:
+ if (size < PAGE_SIZE)
+ kfree(mem);
+ else
+ vfree(mem);
+ return NULL;
}
/*