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memcg: null dereference on allocation failure

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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>
This commit is contained in:
Dan Carpenter 2010-11-11 14:05:12 -08:00 committed by Linus Torvalds
parent 1093736b3c
commit d2e61b8dc9
1 changed files with 9 additions and 7 deletions
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16
mm/memcontrol.c
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@ -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;
}
/*