Only set DIT type on successful initialization

Author: nikic

ext/spl/spl_iterators.c

@@ -1290,7 +1290,6 @@ static spl_dual_it_object* spl_dual_it_construct(INTERNAL_FUNCTION_PARAMETERS, z
 		return NULL;
 	}
 
-	intern->dit_type = dit_type;
 	switch (dit_type) {
 		case DIT_LimitIterator: {
 			intern->u.limit.offset = 0; /* start at beginning */
@@ -1364,6 +1363,7 @@ static spl_dual_it_object* spl_dual_it_construct(INTERNAL_FUNCTION_PARAMETERS, z
 			if (zend_parse_parameters_none() == FAILURE) {
 				return NULL;
 			}
+			intern->dit_type = DIT_AppendIterator;
 			zend_replace_error_handling(EH_THROW, spl_ce_InvalidArgumentException, &error_handling);
 			spl_instantiate(spl_ce_ArrayIterator, &intern->u.append.zarrayit);
 			zend_call_method_with_0_params(Z_OBJ(intern->u.append.zarrayit), spl_ce_ArrayIterator, &spl_ce_ArrayIterator->constructor, "__construct", NULL);
@@ -1385,8 +1385,6 @@ static spl_dual_it_object* spl_dual_it_construct(INTERNAL_FUNCTION_PARAMETERS, z
 				zend_throw_exception_ex(spl_ce_InvalidArgumentException, 0, "Illegal mode " ZEND_LONG_FMT, mode);
 				return NULL;
 			}
-			intern->u.regex.mode = mode;
-			intern->u.regex.regex = zend_string_copy(regex);
 
 			zend_replace_error_handling(EH_THROW, spl_ce_InvalidArgumentException, &error_handling);
 			intern->u.regex.pce = pcre_get_compiled_regex_cache(regex);
@@ -1396,6 +1394,8 @@ static spl_dual_it_object* spl_dual_it_construct(INTERNAL_FUNCTION_PARAMETERS, z
 				/* pcre_get_compiled_regex_cache has already sent error */
 				return NULL;
 			}
+			intern->u.regex.mode = mode;
+			intern->u.regex.regex = zend_string_copy(regex);
 			php_pcre_pce_incref(intern->u.regex.pce);
 			break;
 		}
@@ -1420,6 +1420,7 @@ static spl_dual_it_object* spl_dual_it_construct(INTERNAL_FUNCTION_PARAMETERS, z
 			break;
 	}
 
+	intern->dit_type = dit_type;
 	if (inc_refcount) {
 		Z_ADDREF_P(zobject);
 	}

ext/spl/tests/AppendIterator_invalid_ctor.phpt

@@ -0,0 +1,14 @@
+--TEST--
+AppendIterator::__construct() with invalid arguments
+--FILE--
+<?php
+
+new AppendIterator(null);
+
+?>
+--EXPECTF--
+Fatal error: Uncaught ArgumentCountError: AppendIterator::__construct() expects exactly 0 parameters, 1 given in %s:%d
+Stack trace:
+#0 %s(%d): AppendIterator->__construct(NULL)
+#1 {main}
+  thrown in %s on line %d