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-rw-r--r--security/device_cgroup.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/security/device_cgroup.c b/security/device_cgroup.c
index 19ecc8de9e6..d794abcc4b3 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);
}