macsec: add rcu_barrier() on module exit

Without this, the various uses of call_rcu could cause a kernel panic.

Fixes: c09440f7dcb3 ("macsec: introduce IEEE 802.1AE driver")
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit b196c22af5c3ff784c472c80f6fb4e5fad67b2ac)

Orabug: 24614549

Signed-off-by: Ethan Zhao <ethan.zhao@oracle.com>
Signed-off-by: Dhaval Giani <dhaval.giani@oracle.com>

diff --git a/drivers/net/macsec.c b/drivers/net/macsec.c
index 15c754419ad59d37b49ebdabc7c7ecc99f1ed5e4..81a681d252dd0e8b6f1f0c424866c3be3252f5a5 100644 (file)
--- a/drivers/net/macsec.c
+++ b/drivers/net/macsec.c
@@ -3305,6 +3305,7 @@ static void __exit macsec_exit(void)
        genl_unregister_family(&macsec_fam);
        rtnl_link_unregister(&macsec_link_ops);
        unregister_netdevice_notifier(&macsec_notifier);
+       rcu_barrier();
 }
 
 module_init(macsec_init);