linux-kernel - [PATCH 4.9 081/212] cgroup: add missing skcd->no_refcnt check in cgroup_sk

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Message-Id: <20200820091606.449981045@linuxfoundation.org>
Date:   Thu, 20 Aug 2020 11:20:54 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Yang Yingliang <yangyingliang@...wei.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.9 081/212] cgroup: add missing skcd->no_refcnt check in cgroup_sk_clone()

From: Yang Yingliang <yangyingliang@...wei.com>

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>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 kernel/cgroup.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index f047c73189f36..684d02f343b4c 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