cgroup: fix memory leak in cgroup_get_sb()

opts.release_agent is not kfree()ed in all necessary places.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Paul Menage <menage@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 4 insertions, 1 deletions

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 36066d8a4911..947fe3b22182 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -954,8 +954,11 @@ static int cgroup_get_sb(struct file_system_type *fs_type,
         }
 
         root = kzalloc(sizeof(*root), GFP_KERNEL);
-        if (!root)
+        if (!root) {
+                if (opts.release_agent)
+                        kfree(opts.release_agent);
                 return -ENOMEM;
+        }
 
         init_cgroup_root(root);
         root->subsys_bits = opts.subsys_bits;