netdev - [PATCH net 08/12] netrom: Fix a data-race around sysctl_netrom_transport_requested_window

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Message-Id: <20240304082046.64977-9-kerneljasonxing@gmail.com>
Date: Mon,  4 Mar 2024 16:20:42 +0800
From: Jason Xing <kerneljasonxing@...il.com>
To: ralf@...ux-mips.org,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com
Cc: linux-hams@...r.kernel.org,
	netdev@...r.kernel.org,
	kerneljasonxing@...il.com,
	Jason Xing <kernelxing@...cent.com>
Subject: [PATCH net 08/12] netrom: Fix a data-race around sysctl_netrom_transport_requested_window_size

From: Jason Xing <kernelxing@...cent.com>

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@...cent.com>
---
 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 10eee02ef99e..e65418fb9d88 100644
--- a/net/netrom/af_netrom.c
+++ b/net/netrom/af_netrom.c
@@ -462,7 +462,7 @@ static int nr_create(struct net *net, struct socket *sock, int protocol,
 		msecs_to_jiffies(READ_ONCE(sysctl_netrom_transport_busy_delay));
 	nr->idle   =
 		msecs_to_jiffies(sysctl_netrom_transport_no_activity_timeout);
-	nr->window = sysctl_netrom_transport_requested_window_size;
+	nr->window = READ_ONCE(sysctl_netrom_transport_requested_window_size);
 
 	nr->bpqext = 1;
 	nr->state  = NR_STATE_0;
-- 
2.37.3