Received-SPF: pass (google.com: domain of linux-kernel+bounces-101845-linux.lists.archive=gmail.com@vger.kernel.org designates 147.75.199.223 as permitted sender) client-ip=147.75.199.223;
From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org,
	stable@vger.kernel.org
Cc: Jason Xing <kernelxing@tencent.com>,
	Paolo Abeni <pabeni@redhat.com>,
	Sasha Levin <sashal@kernel.org>
Subject: [PATCH 6.6 42/60] netrom: Fix a data-race around sysctl_netrom_transport_maximum_tries
Date: Wed, 13 Mar 2024 12:36:49 -0400
Message-ID: <20240313163707.615000-43-sashal@kernel.org>
In-Reply-To: <20240313163707.615000-1-sashal@kernel.org>
References: <20240313163707.615000-1-sashal@kernel.org>
Precedence: bulk
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit

From: Jason Xing <kernelxing@tencent.com>

[ Upstream commit e799299aafed417cc1f32adccb2a0e5268b3f6d5 ]

We need to protect the reader reading the sysctl value because the
value can be changed concurrently.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Jason Xing <kernelxing@tencent.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 net/netrom/af_netrom.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/netrom/af_netrom.c b/net/netrom/af_netrom.c
index d8a25f614c500..a3b02f090bba2 100644
--- a/net/netrom/af_netrom.c
+++ b/net/netrom/af_netrom.c
@@ -457,7 +457,7 @@ static int nr_create(struct net *net, struct socket *sock, int protocol,
 	nr->t2     =
 		msecs_to_jiffies(sysctl_netrom_transport_acknowledge_delay);
 	nr->n2     =
-		msecs_to_jiffies(sysctl_netrom_transport_maximum_tries);
+		msecs_to_jiffies(READ_ONCE(sysctl_netrom_transport_maximum_tries));
 	nr->t4     =
 		msecs_to_jiffies(sysctl_netrom_transport_busy_delay);
 	nr->idle   =
-- 
2.43.0