From: Jason Xing <kernelxing@tencent.com>
Date: Mon, 4 Mar 2024 08:20:39 +0000 (+0800)
Subject: netrom: Fix a data-race around sysctl_netrom_transport_maximum_tries
X-Git-Tag: v5.15.152~52
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=f84f7709486d8a578ab4b7d2a556d1b1a59cfc97;p=thirdparty%2Fkernel%2Fstable.git

netrom: Fix a data-race around sysctl_netrom_transport_maximum_tries

[ 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>
---

diff --git a/net/netrom/af_netrom.c b/net/netrom/af_netrom.c
index 6857510967448..678a7bbd84bf2 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   =