Index: if_bridge.c
===================================================================
RCS file: /cvs/src/sys/net/if_bridge.c,v
retrieving revision 1.346
diff -u -p -r1.346 if_bridge.c
--- if_bridge.c	2 Jan 2021 13:16:04 -0000	1.346
+++ if_bridge.c	7 Jan 2021 23:45:03 -0000
@@ -1156,7 +1156,8 @@ bridge_process(struct ifnet *ifp, struct
 
 	sc = brifp->if_softc;
 	SMR_SLIST_FOREACH_LOCKED(bif, &sc->sc_iflist, bif_next) {
-		if (bridge_ourether(bif->ifp, eh->ether_shost))
+		struct arpcom *ac = (struct arpcom *)bif->ifp;
+		if (memcmp(ac->ac_enaddr, eh->ether_shost, ETHER_ADDR_LEN) == 0)
 			goto bad;
 		if (bif->ifp == ifp)
 			bif0 = bif;