Fix crash when posting a message to a send port with port id 0.

runtime/vm/dart_api_impl_test.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "bin/builtin.h"
 #include "include/dart_api.h"
 #include "include/dart_debugger_api.h"
 #include "include/dart_mirrors_api.h"
 #include "include/dart_native_api.h"
 #include "platform/assert.h"
@@ skipping 7123 matching lines @@
   // Post integer value.
   Dart_CObject* response =
       reinterpret_cast<Dart_CObject*>(Dart_ScopeAllocate(sizeof(Dart_CObject)));
   response->type = Dart_CObject_kInt32;
   response->value.as_int32 = 321;
   Dart_PostCObject(
       message->value.as_array.values[0]->value.as_send_port.id, response);
 }
 
 
+TEST_CASE(IllegalNewSendPort) {
+  Dart_Handle error = Dart_NewSendPort(ILLEGAL_PORT);
+  EXPECT(Dart_IsError(error));
+  EXPECT(Dart_IsApiError(error));
+}
+
+
+TEST_CASE(IllegalPost) {
+  Dart_Handle message = Dart_True();
+  bool success = Dart_Post(ILLEGAL_PORT, message);
+  EXPECT(!success);
+}
+
+
 UNIT_TEST_CASE(NewNativePort) {
   // Create a port with a bogus handler.
   Dart_Port error_port = Dart_NewNativePort("Foo", NULL, true);
   EXPECT_EQ(ILLEGAL_PORT, error_port);
 
   // Create the port w/o a current isolate, just to make sure that works.
   Dart_Port port_id1 =
       Dart_NewNativePort("Port123", NewNativePort_send123, true);
 
   TestIsolateScope __test_isolate__;
@@ skipping 1768 matching lines @@
     result = Dart_Invoke(lib,
                          NewString("testView16"),
                          1,
                          dart_args);
     EXPECT_VALID(result);
     EXPECT(Dart_IsString(result));
   }
 }
 
 }  // namespace dart