[src/trunk]: src/sys/netinet don't panic when there's no interface address ex...

[itojun <itojun%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/29c06d7cd95b
branches:  trunk
changeset: 520359:29c06d7cd95b
user:      itojun <itojun%NetBSD.org@localhost>
date:      Tue Jan 08 10:05:13 2002 +0000

description:
don't panic when there's no interface address exist for the specified multicast
outgoing interface (ia == NULL after IFP_TO_IA).

historic behavior (up to revision 1.43) was to use 0.0.0.0 as source address,
but it seems like a mistake according to RFC1112/1122.

diffstat:

 sys/netinet/ip_output.c |  8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diffs (29 lines):

diff -r 3beee7c8003a -r 29c06d7cd95b sys/netinet/ip_output.c
--- a/sys/netinet/ip_output.c   Tue Jan 08 06:58:32 2002 +0000
+++ b/sys/netinet/ip_output.c   Tue Jan 08 10:05:13 2002 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: ip_output.c,v 1.90 2001/11/21 06:28:08 itojun Exp $    */
+/*     $NetBSD: ip_output.c,v 1.91 2002/01/08 10:05:13 itojun Exp $    */
 
 /*
  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
@@ -102,7 +102,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: ip_output.c,v 1.90 2001/11/21 06:28:08 itojun Exp $");
+__KERNEL_RCSID(0, "$NetBSD: ip_output.c,v 1.91 2002/01/08 10:05:13 itojun Exp $");
 
 #include "opt_pfil_hooks.h"
 #include "opt_ipsec.h"
@@ -317,6 +317,10 @@
                        struct in_ifaddr *ia;
 
                        IFP_TO_IA(ifp, ia);
+                       if (!ia) {
+                               error = EADDRNOTAVAIL;
+                               goto bad;
+                       }
                        ip->ip_src = ia->ia_addr.sin_addr;
                }