From 38bcdc42b52c539273848f734421e13b2bd2a50a Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Mon, 21 Nov 2011 08:40:17 -0500
Subject: upas: fix segfault when host not found

R=rsc
CC=plan9port.codebot
http://codereview.appspot.com/5370105
---
 src/cmd/upas/common/libsys.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'src/cmd/upas')

diff --git a/src/cmd/upas/common/libsys.c b/src/cmd/upas/common/libsys.c
index 8e55fc4d..b439cfde 100644
--- a/src/cmd/upas/common/libsys.c
+++ b/src/cmd/upas/common/libsys.c
@@ -465,6 +465,9 @@ sysnames_read(void)
 		return namev;
 
 	h = gethostbyname(alt_sysname_read());
+	if(h == nil)
+		return 0;
+
 	for(p=h->h_aliases; *p; p++)
 		;
 	
@@ -491,7 +494,7 @@ domainname_read(void)
 	char **namev, *p;
 	Ndbtuple *t;
 
-	for(namev = sysnames_read(); *namev; namev++){
+	for(namev = sysnames_read(); namev && *namev; namev++){
 		if(strchr(*namev, '.')){
 			for(p=*namev-1; p && *++p; p=strchr(p, '.')){
 				if((t = dnsquery(nil, p, "mx")) != nil){
-- 
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