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cgroup: add missing skcd->no_refcnt check in cgroup_sk_clone()

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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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Yang Yingliang 2020-08-13 20:33:42 +00:00 committed by Greg Kroah-Hartman
parent 37274b5c9b
commit 38de4308c5
1 changed files with 2 additions and 0 deletions
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2
kernel/cgroup/cgroup.c
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@ -5957,6 +5957,8 @@ 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.