From dd97923d82488b21187608f831c46ec5e2fd9e8d Mon Sep 17 00:00:00 2001
From: Michael Hoisie <hoisie@gmail.com>
Date: Tue, 26 Jan 2010 16:18:29 -0800
Subject: [PATCH] net: fix segfault if /etc/hosts fails to open or doesn't
 exist

R=rsc
CC=golang-dev, r
https://golang.org/cl/194043
---
 src/pkg/net/hosts.go | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/pkg/net/hosts.go b/src/pkg/net/hosts.go
index 25af7968dbb..266ce3f3700 100644
--- a/src/pkg/net/hosts.go
+++ b/src/pkg/net/hosts.go
@@ -30,7 +30,9 @@ func readHosts() {
 	if len(hosts.data) == 0 || hosts.time+cacheMaxAge <= now || hosts.path != hp {
 		hs := make(map[string][]string)
 		var file *file
-		file, _ = open(hp)
+		if file, _ = open(hp); file == nil {
+			return
+		}
 		for line, ok := file.readLine(); ok; line, ok = file.readLine() {
 			if i := byteIndex(line, '#'); i >= 0 {
 				// Discard comments.