[PATCH 4.19 20/41] netrom: Fix a data-race around sysctl_netrom_transport_no_activity_timeout

[Sasha Levin]

From: Jason Xing <kernelxing@xxxxxxxxxxx>

[ Upstream commit f99b494b40431f0ca416859f2345746199398e2b ]

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@xxxxxxxxxxx>
Signed-off-by: Paolo Abeni <pabeni@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 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 1d4b4d228ca0b..3277f9a7ed02b 100644
--- a/net/netrom/af_netrom.c
+++ b/net/netrom/af_netrom.c
@@ -464,7 +464,7 @@ static int nr_create(struct net *net, struct socket *sock, int protocol,
 	nr->t4     =
 		msecs_to_jiffies(READ_ONCE(sysctl_netrom_transport_busy_delay));
 	nr->idle   =
-		msecs_to_jiffies(sysctl_netrom_transport_no_activity_timeout);
+		msecs_to_jiffies(READ_ONCE(sysctl_netrom_transport_no_activity_timeout));
 	nr->window = READ_ONCE(sysctl_netrom_transport_requested_window_size);
 
 	nr->bpqext = 1;
-- 
2.43.0