1 files changed, 2 insertions, 0 deletions

diff --git a/security/device_cgroup.c b/security/device_cgroup.c
index 19ecc8de9e6b..d794abcc4b3b 100644
--- a/security/device_cgroup.c
+++ b/security/device_cgroup.c
@@ -215,7 +215,9 @@ static void devcgroup_css_free(struct cgroup *cgroup)
         struct dev_cgroup *dev_cgroup;
 
         dev_cgroup = cgroup_to_devcgroup(cgroup);
+        mutex_lock(&devcgroup_mutex);
         dev_exception_clean(dev_cgroup);
+        mutex_unlock(&devcgroup_mutex);
         kfree(dev_cgroup);
 }