Fix crash when empty address from DNS overlays A record from hosts.

CHANGELOG

@@ -13,6 +13,11 @@ version 2.76
 	    was a dangling symbolic link, even of --no-resolv set.
 	    Thanks to Alexander Kurtz for spotting the problem.
 
+	    Fix crash when an A or AAAA record is defined locally,
+	    in a hosts file, and an upstream server sends a reply
+	    that the same name is empty. Thanks to Edwin Török for
+	    the patch.
+
 	
 version 2.75
             Fix reversion on 2.74 which caused 100% CPU use when a 

src/cache.c

@@ -481,7 +481,7 @@ struct crec *cache_insert(char *name, struct all_addr *addr,
 	 existing record is for an A or AAAA and
 	 the record we're trying to insert is the same, 
 	 just drop the insert, but don't error the whole process. */
-      if ((flags & (F_IPV4 | F_IPV6)) && (flags & F_FORWARD))
+      if ((flags & (F_IPV4 | F_IPV6)) && (flags & F_FORWARD) && addr)
 	{
 	  if ((flags & F_IPV4) && (new->flags & F_IPV4) &&
 	      new->addr.addr.addr.addr4.s_addr == addr->addr.addr4.s_addr)