Fixed GH-18902: ldap_exop/ldap_exop_sync assert triggered on empty request OID

Author: devnexen

ext/ldap/ldap.c

@@ -4036,7 +4036,12 @@ static void php_ldap_exop(INTERNAL_FUNCTION_PARAMETERS, bool force_sync) {
 	LDAPControl **lserverctrls = NULL;
 	int rc, msgid;
 
-	if (zend_parse_parameters(ZEND_NUM_ARGS(), "OS|S!a!zz", &link, ldap_link_ce, &reqoid, &reqdata, &serverctrls, &retdata, &retoid) != SUCCESS) {
+	if (zend_parse_parameters(ZEND_NUM_ARGS(), "OP|S!a!zz", &link, ldap_link_ce, &reqoid, &reqdata, &serverctrls, &retdata, &retoid) != SUCCESS) {
+		RETURN_THROWS();
+	}
+
+	if (ZSTR_LEN(reqoid) == 0) {
+		zend_argument_value_error(2, "cannot be empty");
 		RETURN_THROWS();
 	}