[SharedArrayBuffer] Prevent SharedArrayBuffer being used in Web APIs

third_party/WebKit/Source/modules/webmidi/MIDIOutput.cpp

 /*
  * Copyright (C) 2013 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 203 matching lines @@
                        const String& id,
                        const String& manufacturer,
                        const String& name,
                        const String& version,
                        PortState state)
     : MIDIPort(access, id, manufacturer, name, TypeOutput, version, state),
       m_portIndex(portIndex) {}
 
 MIDIOutput::~MIDIOutput() {}
 
-void MIDIOutput::send(DOMUint8Array* array,
+void MIDIOutput::send(const MaybeShared<DOMUint8Array>& maybeShared,
                       double timestamp,
                       ExceptionState& exceptionState) {
-  DCHECK(array);
+  DCHECK(maybeShared);
+  if (maybeShared.isShared()) {
+    exceptionState.throwTypeError(
+        "The array is backed by a SharedArrayBuffer.");
+    return;
+  }
+  DOMUint8Array* array = maybeShared.viewNotShared();
 
   if (timestamp == 0.0)
     timestamp = now(getExecutionContext());
 
   // Implicit open. It does nothing if the port is already opened.
   // This should be performed even if |array| is invalid.
   open();
 
   if (MessageValidator::validate(array, exceptionState,
                                  midiAccess()->sysexEnabled()))
@@ skipping 18 matching lines @@
                                     ") is greater than 0xFF.");
       return;
     }
     if (i < arrayLength)
       arrayData[i] = unsignedData[i] & 0xff;
   }
 
   send(array, timestamp, exceptionState);
 }
 
-void MIDIOutput::send(DOMUint8Array* data, ExceptionState& exceptionState) {
+void MIDIOutput::send(const MaybeShared<DOMUint8Array>& data,
+                      ExceptionState& exceptionState) {
   DCHECK(data);
   send(data, 0.0, exceptionState);
 }
 
 void MIDIOutput::send(Vector<unsigned> unsignedData,
                       ExceptionState& exceptionState) {
   send(unsignedData, 0.0, exceptionState);
 }
 
 DEFINE_TRACE(MIDIOutput) {
   MIDIPort::trace(visitor);
 }
 
 }  // namespace blink