cgroup: fix memory leak in cgroup_rm_cftypes()

The memory allocated in cgroup_add_cftypes() should be freed. The
effect of this bug is we leak a bit memory everytime we unload
cfq-iosched module if blkio cgroup is enabled.

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

1 files changed, 2 insertions, 1 deletions

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 7db2940bfc77..1d4f471de8d5 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -2889,7 +2889,8 @@ int cgroup_rm_cftypes(struct cgroup_subsys *ss, struct cftype *cfts)
 
         list_for_each_entry(set, &ss->cftsets, node) {
                 if (set->cfts == cfts) {
-                        list_del_init(&set->node);
+                        list_del(&set->node);
+                        kfree(set);
                         cgroup_cfts_commit(ss, cfts, false);
                         return 0;
                 }