Check if it is object in Promise.prototype.then

Fix issue #1881

JerryScript-DCO-1.0-Signed-off-by: Zidong Jiang zidong.jiang@intel.com

jerry-core/ecma/operations/ecma-promise-object.c

@@ -743,6 +743,11 @@ ecma_promise_then (ecma_value_t promise, /**< the promise which call 'then' */
                    ecma_value_t on_fulfilled, /**< on_fulfilled function */
                    ecma_value_t on_rejected) /**< on_rejected function */
 {
+  if (!ecma_is_value_object (promise))
+  {
+    return ecma_raise_type_error (ECMA_ERR_MSG ("'this' is not an object."));
+  }
+
   ecma_object_t *obj = ecma_get_object_from_value (promise);
 
   if (!ecma_is_promise (obj))

tests/jerry/es2015/regression-test-issue-1881.js

@@ -0,0 +1,15 @@
+// Copyright JS Foundation and other contributors, http://js.foundation
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+new Promise(isFinite.toString).catch(Promise.prototype.then)