DevTools: validate protocol input parameters.

third_party/WebKit/Source/platform/v8_inspector/V8RuntimeAgentImpl.cpp

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 134 matching lines @@
     InjectedScript* injectedScript = m_injectedScriptManager->findInjectedScript(remoteId.get());
     if (!injectedScript) {
         *errorString = "Inspected frame has gone";
         return;
     }
 
     IgnoreExceptionsScope ignoreExceptionsScope(m_debugger);
 
     injectedScript->getProperties(errorString, objectId, ownProperties.fromMaybe(false), accessorPropertiesOnly.fromMaybe(false), generatePreview.fromMaybe(false), result, exceptionDetails);
 
-    if (!exceptionDetails->isJust() && !accessorPropertiesOnly.fromMaybe(false))
+    if (errorString->isEmpty() && !exceptionDetails->isJust() && !accessorPropertiesOnly.fromMaybe(false))
         injectedScript->getInternalProperties(errorString, objectId, internalProperties, exceptionDetails);
 }
 
 void V8RuntimeAgentImpl::releaseObject(ErrorString* errorString, const String& objectId)
 {
     OwnPtr<RemoteObjectId> remoteId = RemoteObjectId::parse(objectId);
     if (!remoteId) {
         *errorString = "Invalid object id";
         return;
     }
@@ skipping 269 matching lines @@
     OwnPtr<ExceptionDetails> exceptionDetails = ExceptionDetails::create().setText(toWTFStringWithTypeCheck(message->Get())).build();
     exceptionDetails->setLine(message->GetLineNumber());
     exceptionDetails->setColumn(message->GetStartColumn());
     v8::Local<v8::StackTrace> messageStackTrace = message->GetStackTrace();
     if (!messageStackTrace.IsEmpty() && messageStackTrace->GetFrameCount() > 0)
         exceptionDetails->setStack(m_debugger->createStackTrace(messageStackTrace, messageStackTrace->GetFrameCount())->buildInspectorObject());
     return exceptionDetails.release();
 }
 
 } // namespace blink