svn commit: r347466 - head/sys/netinet

[Gleb Smirnoff]

Author: glebius
Date: Fri May 10 21:51:17 2019
New Revision: 347466
URL: https://svnweb.freebsd.org/changeset/base/347466

Log:
  Fix regression from r347375: do not panic when sending an IP multicast
  packet from an interface that doesn't have IPv4 address.
  
  Reported by:	Michael Butler <imb protected-networks.net>

Modified:
  head/sys/netinet/ip_output.c

Modified: head/sys/netinet/ip_output.c
==============================================================================
--- head/sys/netinet/ip_output.c	Fri May 10 20:15:40 2019	(r347465)
+++ head/sys/netinet/ip_output.c	Fri May 10 21:51:17 2019	(r347466)
@@ -361,7 +361,11 @@ again:
 		mtu = ifp->if_mtu;
 		IFP_TO_IA(ifp, ia, &in_ifa_tracker);
 		isbroadcast = 0;	/* fool gcc */
-		src = IA_SIN(ia)->sin_addr;
+		/* Interface may have no addresses. */
+		if (ia != NULL)
+			src = IA_SIN(ia)->sin_addr;
+		else
+			src.s_addr = INADDR_ANY;
 	} else if (ro != NULL) {
 		if (ro->ro_rt == NULL) {
 			/*