Add missing ecma_deref_ecma_string in ecma_builtin_typedarray_prototype_join (#2701)

This patch fixes #2698.

JerryScript-DCO-1.0-Signed-off-by: Robert Fancsik frobert@inf.u-szeged.hu

Author: rerobika

jerry-core/ecma/builtin-objects/typedarray/ecma-builtin-typedarray-prototype.c

@@ -1027,6 +1027,7 @@ ecma_builtin_typedarray_prototype_join (ecma_value_t this_arg, /**< this argumen
         ecma_value_t next_string_value = ecma_op_typedarray_get_to_string_at_index (obj_p, k);
         if (ECMA_IS_VALUE_ERROR (next_string_value))
         {
+          ecma_deref_ecma_string (return_string_p);
           ecma_free_value (first_value);
           ecma_free_value (separator_value);
           ecma_free_value (length_value);

tests/jerry/es2015/regression-test-issue-2698.js

@@ -0,0 +1,20 @@
+// 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.
+
+try {
+  Uint8Array.prototype.join.call([ "2015-01-01T00:", { toString : '2,1,3,4,0' } ], [ ]) ;
+  assert (false);
+} catch (e) {
+  assert (e instanceof TypeError);
+}