This is a note to let you know that I've just added the patch titled
netrom: Fix a data-race around sysctl_netrom_routing_control
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
netrom-fix-a-data-race-around-sysctl_netrom_routing_.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit a7708c7c94bd98cd9ec11ecd23edf0d1974f92f1
Author: Jason Xing <kernelxing@xxxxxxxxxxx>
Date: Mon Mar 4 16:20:44 2024 +0800
netrom: Fix a data-race around sysctl_netrom_routing_control
[ Upstream commit b5dffcb8f71bdd02a4e5799985b51b12f4eeaf76 ]
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>
diff --git a/net/netrom/nr_route.c b/net/netrom/nr_route.c
index 929446e246b36..eb285b12977b7 100644
--- a/net/netrom/nr_route.c
+++ b/net/netrom/nr_route.c
@@ -780,7 +780,7 @@ int nr_route_frame(struct sk_buff *skb, ax25_cb *ax25)
return ret;
}
- if (!sysctl_netrom_routing_control && ax25 != NULL)
+ if (!READ_ONCE(sysctl_netrom_routing_control) && ax25 != NULL)
return 0;
/* Its Time-To-Live has expired */
