1 files changed, 2 insertions, 0 deletions

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 220e0fd659fa..d7ab4ffd8fd9 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -2792,8 +2792,10 @@ void cgroup_post_fork(struct task_struct *child)
 {
         if (use_task_css_set_links) {
                 write_lock(&css_set_lock);
+                task_lock(child);
                 if (list_empty(&child->cg_list))
                         list_add(&child->cg_list, &child->cgroups->tasks);
+                task_unlock(child);
                 write_unlock(&css_set_lock);
         }
 }