src/share/vm/prims/jvmtiEnv.cpp

@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 2003, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2003, 2019, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.

@@ -1619,10 +1619,17 @@
     if (k_oop == NULL) {
       return JVMTI_ERROR_INVALID_CLASS;
     }
   }
 
+  if (initial_object != NULL) {
+    oop init_obj = JNIHandles::resolve_external_guard(initial_object);
+    if (init_obj == NULL) {
+      return JVMTI_ERROR_INVALID_OBJECT;
+    }
+  }
+
   Thread *thread = Thread::current();
   HandleMark hm(thread);
   KlassHandle kh (thread, k_oop);
 
   TraceTime t("FollowReferences", TraceJVMTIObjectTagging);