From 18c95d11c347a12e5c31df1325cef6b995d14ecf Mon Sep 17 00:00:00 2001
From: Jason Xing <kernelxing@tencent.com>
Date: Mon, 4 Mar 2024 16:20:36 +0800
Subject: [PATCH] netrom: Fix a data-race around
sysctl_netrom_obsolescence_count_initialiser
[ Upstream commit cfd9f4a740f772298308b2e6070d2c744fb5cf79 ]
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/nr_route.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/netrom/nr_route.c b/net/netrom/nr_route.c
index 94c4d4554b9c..8a5375e1dcc7 100644
--- a/net/netrom/nr_route.c
+++ b/net/netrom/nr_route.c
@@ -763,7 +763,7 @@ int nr_route_frame(struct sk_buff *skb, ax25_cb *ax25)
if (ax25 != NULL) {
ret = nr_add_node(nr_src, "", &ax25->dest_addr, ax25->digipeat,
ax25->ax25_dev->dev, 0,
- sysctl_netrom_obsolescence_count_initialiser);
+ READ_ONCE(sysctl_netrom_obsolescence_count_initialiser));
if (ret)
return ret;
}