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netrom: Fix a data-race around sysctl_netrom_link_fails_count
[ Upstream commitbc76645ebd
] 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>
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@ -728,7 +728,7 @@ void nr_link_failed(ax25_cb *ax25, int reason)
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nr_neigh->ax25 = NULL;
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ax25_cb_put(ax25);
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if (++nr_neigh->failed < sysctl_netrom_link_fails_count) {
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if (++nr_neigh->failed < READ_ONCE(sysctl_netrom_link_fails_count)) {
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nr_neigh_put(nr_neigh);
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return;
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}
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