[PATCH stable-4.9] cgroup: add missing skcd->no_refcnt check in cgroup_sk_alloc()

Add skcd->no_refcnt check which is missed when backporting ad0f75e5f57c ("cgroup: fix cgroup_sk_alloc() for sk_clone_lock()").

This patch is needed in stable-4.9, stable-4.14 and stable-4.19.

Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- kernel/cgroup.c | 2 ++ 1 file changed, 2 insertions(+)

diff --git a/kernel/cgroup.c b/kernel/cgroup.c index f047c73189f3..684d02f343b4 100644 --- a/kernel/cgroup.c +++ b/kernel/cgroup.c @@ -6355,6 +6355,8 @@ void cgroup_sk_clone(struct sock_cgroup_data *skcd) { /* Socket clone path */ if (skcd->val) { + if (skcd->no_refcnt) + return; /* * We might be cloning a socket which is left in an empty * cgroup and the cgroup might have already been rmdir'd.