linux-kernel - [PATCH stable-4.9] cgroup: add missing skcd->no_refcnt check in cgroup_sk

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Message-ID: <20200813202337.1113994-1-yangyingliang@huawei.com>
Date:   Thu, 13 Aug 2020 20:23:37 +0000
From:   Yang Yingliang <yangyingliang@...wei.com>
To:     <linux-kernel@...r.kernel.org>, <stable@...r.kernel.org>
CC:     <gregkh@...uxfoundation.org>, <tj@...nel.org>,
        <lizefan@...wei.com>, <xiyou.wangcong@...il.com>
Subject: [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@...wei.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