cgroup: fix a leak when percpu_ref_init() fails

ss->css_free() is not called when perfcpu_ref_init() fails.

Signed-off-by: Li Zefan <lizefan@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index afb8d53ca6c7..468e410f9e61 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -4344,8 +4344,10 @@ static long cgroup_create(struct cgroup *parent, struct dentry *dentry,
                 }
 
                 err = percpu_ref_init(&css->refcnt, css_release);
-                if (err)
+                if (err) {
+                        ss->css_free(cgrp);
                         goto err_free_all;
+                }
 
                 init_cgroup_css(css, ss, cgrp);