Commit d8f1da00 authored by Jason Xing's avatar Jason Xing Committed by Ma Wupeng
Browse files

netrom: Fix a data-race around sysctl_netrom_routing_control 

stable inclusion
from stable-v6.6.22
commit d732b83251322ecd3b503e03442247745d6052ce
bugzilla: https://gitee.com/openeuler/kernel/issues/I99TJK

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=d732b83251322ecd3b503e03442247745d6052ce



--------------------------------

[ Upstream commit b5dffcb8f71bdd02a4e5799985b51b12f4eeaf76 ]

We need to protect the reader reading the sysctl value because the
value can be changed concurrently.

Fixes: 1da177e4 ("Linux-2.6.12-rc2")
Signed-off-by: default avatarJason Xing <kernelxing@tencent.com>
Signed-off-by: default avatarPaolo Abeni <pabeni@redhat.com>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
Signed-off-by: default avatarZhangPeng <zhangpeng362@huawei.com>
parent 1593f440

net/netrom/nr_route.c

+1 −1
Original line number Diff line number Diff line
@@ -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 */