From 8ad076b280659245702f943b00188589820aafeb Mon Sep 17 00:00:00 2001
From: Nigel Metheringham <nigel@exim.org>
Date: Thu, 18 Oct 2007 12:00:43 +0000
Subject: [PATCH] Defend against bad data from gethostbyaddr().  Fixes bug #619

---
 doc/doc-txt/ChangeLog | 4 +++-
 src/src/host.c        | 4 ++--
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/doc/doc-txt/ChangeLog b/doc/doc-txt/ChangeLog
index 63abba29c..fa7a84f14 100644
--- a/doc/doc-txt/ChangeLog
+++ b/doc/doc-txt/ChangeLog
@@ -1,4 +1,4 @@
-$Cambridge: exim/doc/doc-txt/ChangeLog,v 1.533 2007/09/28 13:04:16 tom Exp $
+$Cambridge: exim/doc/doc-txt/ChangeLog,v 1.534 2007/10/18 12:00:43 nm4 Exp $
 
 Change log file for Exim from version 4.21
 -------------------------------------------
@@ -19,6 +19,8 @@ NM/01 Bugzilla 592: --help option is handled incorrectly if exim is invoked
 
 SC/01 Added the -bylocaldomain option to eximstats.
 
+NM/02 Bugzilla 619: Defended against bad data coming back from gethostbyaddr
+
 Exim version 4.68
 -----------------
 
diff --git a/src/src/host.c b/src/src/host.c
index b353fe2db..18821035c 100644
--- a/src/src/host.c
+++ b/src/src/host.c
@@ -1,4 +1,4 @@
-/* $Cambridge: exim/src/src/host.c,v 1.28 2007/01/08 10:50:18 ph10 Exp $ */
+/* $Cambridge: exim/src/src/host.c,v 1.29 2007/10/18 12:01:00 nm4 Exp $ */
 
 /*************************************************
 *     Exim - an Internet mail transport agent    *
@@ -1502,7 +1502,7 @@ if (hosts == NULL)
 treat this as non-existent. In some operating systems, this is returned as an
 empty string; in others as a single dot. */
 
-if (hosts->h_name[0] == 0 || hosts->h_name[0] == '.')
+if (hosts->h_name == NULL || hosts->h_name[0] == 0 || hosts->h_name[0] == '.')
   {
   HDEBUG(D_host_lookup) debug_printf("IP address lookup yielded an empty name: "
     "treated as non-existent host name\n");
-- 
2.25.1