From: Yang Yingliang <yangyingliang@huawei.com>
To: <linux-kernel@vger.kernel.org>, <stable@vger.kernel.org>
Cc: <gregkh@linuxfoundation.org>, <tj@kernel.org>,
<lizefan@huawei.com>, <xiyou.wangcong@gmail.com>
Subject: [PATCH stable-4.9] cgroup: add missing skcd->no_refcnt check in cgroup_sk_alloc()
Date: Thu, 13 Aug 2020 20:23:37 +0000 [thread overview]
Message-ID: <20200813202337.1113994-1-yangyingliang@huawei.com> (raw)
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.
--
2.25.1
reply other threads:[~2020-08-13 12:25 UTC|newest]
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