Commit ea2e2297 authored by Jason Xing's avatar Jason Xing Committed by Ma Wupeng
Browse files

netrom: Fix a data-race around sysctl_netrom_link_fails_count 

stable inclusion
from stable-v6.6.22
commit db364859ce68fb3a52d42cd87a54da3dc42dc1c8
bugzilla: https://gitee.com/openeuler/kernel/issues/I99TJK

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=db364859ce68fb3a52d42cd87a54da3dc42dc1c8



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

[ Upstream commit bc76645ebdd01be9b9994dac39685a3d0f6f7985 ]

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 d8f1da00

net/netrom/nr_route.c

+1 −1
Original line number Diff line number Diff line
@@ -728,7 +728,7 @@ void nr_link_failed(ax25_cb *ax25, int reason) 
	nr_neigh->ax25 = NULL;

	ax25_cb_put(ax25);



	if (++nr_neigh->failed < sysctl_netrom_link_fails_count) {

	if (++nr_neigh->failed < READ_ONCE(sysctl_netrom_link_fails_count)) {

		nr_neigh_put(nr_neigh);

		return;

	}