Fix a rare configuration-dependent crash. Simon Kelley, upstream

maintainer, wrote in message <4F70361B.7080306@thekelleys.org.uk>:

    A bug has been found in dnsmasq 2.60 that can cause crashes. This is
    configuration dependent: it either crashes frequently or not at all.
    The configuration required is one which allows dnsmasq to receive
    DHCPINFORM requests for which there is no valid dhcp-range. This is
    rare.

Adding the patch he offers for download.

Feature safe: yes

dns/dnsmasq/Makefile

@@ -7,6 +7,7 @@
 
 PORTNAME=	dnsmasq
 DISTVERSION=	2.60
+PORTREVISION=	1
 PORTEPOCH=	1
 CATEGORIES=	dns ipv6
 MASTER_SITES=	http://www.thekelleys.org.uk/dnsmasq/ \

dns/dnsmasq/files/patch-src__rfc2131.c

@@ -0,0 +1,12 @@
+--- ./src/rfc2131.c.orig	2012-03-04 21:04:22.000000000 +0100
++++ ./src/rfc2131.c	2012-04-01 13:14:33.000000000 +0200
+@@ -2095,7 +2095,8 @@
+   struct dhcp_netid_list *id_list;
+ 
+   /* filter options based on tags, those we want get DHOPT_TAGOK bit set */
+-  context->netid.next = NULL;
++  if (context)
++    context->netid.next = NULL;
+   tagif = option_filter(netid, context && context->netid.net ? &context->netid : NULL, config_opts);
+ 	
+   /* logging */