[SharedArrayBuffer] Prevent SharedArrayBuffer being used in Web APIs

third_party/WebKit/Source/modules/webaudio/PeriodicWave.cpp

 /*
  * Copyright (C) 2012 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 63 matching lines @@
                             String::number(imagLength) + ") must match.");
     return nullptr;
   }
 
   PeriodicWave* periodicWave = new PeriodicWave(context.sampleRate());
   periodicWave->createBandLimitedTables(real, imag, realLength,
                                         disableNormalization);
   return periodicWave;
 }
 
-PeriodicWave* PeriodicWave::create(BaseAudioContext& context,
-                                   DOMFloat32Array* real,
-                                   DOMFloat32Array* imag,
-                                   bool disableNormalization,
-                                   ExceptionState& exceptionState) {
+PeriodicWave* PeriodicWave::create(
+    BaseAudioContext& context,
+    const MaybeShared<DOMFloat32Array>& realMaybeShared,
+    const MaybeShared<DOMFloat32Array>& imagMaybeShared,
+    bool disableNormalization,
+    ExceptionState& exceptionState) {
   DCHECK(isMainThread());
 
+  if (realMaybeShared.isShared() || imagMaybeShared.isShared()) {
+    exceptionState.throwTypeError(
+        "real and imag should not be backed by a SharedArrayBuffer.");
+    return nullptr;
+  }
+  DOMFloat32Array* real = realMaybeShared.viewNotShared();
+  DOMFloat32Array* imag = imagMaybeShared.viewNotShared();
+
   return create(context, real->length(), real->data(), imag->length(),
                 imag->data(), disableNormalization, exceptionState);
 }
 
 PeriodicWave* PeriodicWave::create(BaseAudioContext* context,
                                    const PeriodicWaveOptions& options,
                                    ExceptionState& exceptionState) {
   bool normalize = options.hasDisableNormalization()
                        ? options.disableNormalization()
                        : false;
@@ skipping 296 matching lines @@
     }
 
     realP[n] = 0;
     imagP[n] = b;
   }
 
   createBandLimitedTables(realP, imagP, halfSize, false);
 }
 
 }  // namespace blink