Index: standard/dns.c
===================================================================
RCS file: /repository/php-src/ext/standard/dns.c,v
retrieving revision 1.70.2.7.2.2
diff -u -r1.70.2.7.2.2 dns.c
--- standard/dns.c	24 Feb 2007 02:17:27 -0000	1.70.2.7.2.2
+++ standard/dns.c	10 May 2007 12:39:10 -0000
@@ -264,6 +264,12 @@
 			}
 			type = T_MX;
 			convert_to_string_ex(arg1);
+			
+			if (Z_STRLEN_PP(arg1) == 0)
+			{
+				php_error_docref(NULL TSRMLS_CC, E_WARNING, "Host cannot be empty");
+				RETURN_FALSE;
+			}
 			break;
 
 		case 2:
@@ -273,6 +279,12 @@
 			convert_to_string_ex(arg1);
 			convert_to_string_ex(arg2);
 
+			if (Z_STRLEN_PP(arg1) == 0 || Z_STRLEN_PP(arg2) == 0)
+			{
+				php_error_docref(NULL TSRMLS_CC, E_WARNING, "Host and type cannot be empty");
+				RETURN_FALSE;
+			}
+
 			if (!strcasecmp("A", Z_STRVAL_PP(arg2))) type = T_A;
 			else if (!strcasecmp("NS",    Z_STRVAL_PP(arg2))) type = DNS_T_NS;
 			else if (!strcasecmp("MX",    Z_STRVAL_PP(arg2))) type = DNS_T_MX;