kern/40723: Disabling multicast on vlan interface caused kernel panic

[Hideki ONO]

This bug(kenr/40723) is still reproducible on FreeBSD 4.8R (and
probably on 5.1R).
Following patch seems to fix the problem for me.

--- if.c        14 Jun 2003 08:22:02 -0000      1.34
+++ if.c        25 Jun 2003 09:16:59 -0000
@@ -1556,8 +1556,10 @@
                               M_IFMADDR, M_WAITOK);
                        bcopy(llsa, dupsa, llsa->sa_len);
                        ifma->ifma_addr = dupsa;
+                       ifma->ifma_lladdr = NULL;
                        ifma->ifma_ifp = ifp;
                        ifma->ifma_refcount = 1;
+                       ifma->ifma_protospec = 0;
                        s = splimp();
                        LIST_INSERT_HEAD(&ifp->if_multiaddrs, ifma,
                        ifma_link);
                        splx(s);
--
ono at kame.net