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authorVladimir Davydov <vdavydov@parallels.com>2014-01-30 15:46:14 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2014-01-30 16:56:56 -0800
commit7c094fd698de2f333fa39b6da213f880d40b9bfe (patch)
tree434b53bc87fd5bcc3293b0bc6f4328fb31ac1f2b /mm
parent46bf16c44b90791445975463da671521fc430cae (diff)
downloadlinux-7c094fd698de2f333fa39b6da213f880d40b9bfe.tar.gz
memcg: fix mutex not unlocked on memcg_create_kmem_cache fail path
Commit 842e2873697e ("memcg: get rid of kmem_cache_dup()") introduced a mutex for memcg_create_kmem_cache() to protect the tmp_name buffer that holds the memcg name. It failed to unlock the mutex if this buffer could not be allocated. This patch fixes the issue by appropriately unlocking the mutex if the allocation fails. Signed-off-by: Vladimir Davydov <vdavydov@parallels.com> Cc: Michal Hocko <mhocko@suse.cz> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Glauber Costa <glommer@parallels.com> Acked-by: David Rientjes <rientjes@google.com> 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.c7
1 files changed, 3 insertions, 4 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 19d5d4274e2..53385cd4e6f 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -3400,7 +3400,7 @@ void mem_cgroup_destroy_cache(struct kmem_cache *cachep)
static struct kmem_cache *memcg_create_kmem_cache(struct mem_cgroup *memcg,
struct kmem_cache *s)
{
- struct kmem_cache *new;
+ struct kmem_cache *new = NULL;
static char *tmp_name = NULL;
static DEFINE_MUTEX(mutex); /* protects tmp_name */
@@ -3416,7 +3416,7 @@ static struct kmem_cache *memcg_create_kmem_cache(struct mem_cgroup *memcg,
if (!tmp_name) {
tmp_name = kmalloc(PATH_MAX, GFP_KERNEL);
if (!tmp_name)
- return NULL;
+ goto out;
}
rcu_read_lock();
@@ -3426,12 +3426,11 @@ static struct kmem_cache *memcg_create_kmem_cache(struct mem_cgroup *memcg,
new = kmem_cache_create_memcg(memcg, tmp_name, s->object_size, s->align,
(s->flags & ~SLAB_PANIC), s->ctor, s);
-
if (new)
new->allocflags |= __GFP_KMEMCG;
else
new = s;
-
+out:
mutex_unlock(&mutex);
return new;
}