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From 20812729e3e47a193a21d326ecd036d67a8b2724 Mon Sep 17 00:00:00 2001
From: "Heiko Schlittermann (HS12-RIPE)" <hs@schlittermann.de>
Date: Sun, 16 May 2021 19:11:19 +0200
Subject: [PATCH] Fix host_name_lookup (Close 2747)
Thanks to Nico R for providing a reproducing configuration.
host_lookup = *
message_size_limit = ${if def:sender_host_name {32M}{32M}}
acl_smtp_connect = acl_smtp_connect
acl_smtp_rcpt = acl_smtp_rcpt
begin acl
acl_smtp_connect:
warn ratelimit = 256 / 1m / per_conn
accept
acl_smtp_rcpt:
accept hosts = 127.0.0.*
begin routers
null:
driver = accept
transport = null
begin transports
null:
driver = appendfile
file = /dev/null
Tested with
swaks -f mailbox@example.org -t mailbox@example.org --pipe 'exim -bh 127.0.0.1 -C /opt/exim/etc/exim-bug.conf'
The IP must have a PTR to "localhost." to reproduce it.
---
src/host.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
Index: exim4-4.92/src/host.c
===================================================================
--- exim4-4.92.orig/src/host.c
+++ exim4-4.92/src/host.c
@@ -1593,7 +1593,7 @@ while (*s != 0) *t++ = tolower(*s++);
if (hosts->h_aliases != NULL)
{
- int count = 1;
+ int count = 1; /* need 1 more for terminating NULL */
uschar **aliases, **ptr;
for (aliases = USS hosts->h_aliases; *aliases != NULL; aliases++) count++;
ptr = sender_host_aliases = store_get_perm(count * sizeof(uschar *));
@@ -1703,7 +1703,7 @@ while ((ordername = string_nextinlist(&l
{
uschar **aptr = NULL;
int ssize = 264;
- int count = 0;
+ int count = 1; /* need 1 more for terminating NULL */
int old_pool = store_pool;
sender_host_dnssec = dns_is_secure(&dnsa);
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