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netrom: Fix a data-race around sysctl_netrom_link_fails_count 

[ Upstream commit bc76645ebd ]

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

Fixes: 1da177e4c3 ("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>
This commit is contained in:
Jason Xing 2024-03-04 16:20:45 +08:00 committed by Sasha Levin
parent 859175d4bc
commit 0b8eb369c1
1 changed files with 1 additions and 1 deletions
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2
net/netrom/nr_route.c
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@ -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;
}