Check for NaN when creating a DelayNode for WebAudio

Source/platform/audio/AudioDelayDSPKernel.cpp

 /*
  * Copyright (C) 2010, 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 11 matching lines @@
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 
 #if ENABLE(WEB_AUDIO)
 
 #include "platform/audio/AudioDelayDSPKernel.h"
 
 #include "platform/audio/AudioUtilities.h"
+#include "wtf/MathExtras.h"
 #include <algorithm>
 
 using namespace std;
 
 namespace WebCore {
 
 const float SmoothingTimeConstant = 0.020f; // 20ms
 
 AudioDelayDSPKernel::AudioDelayDSPKernel(AudioDSPKernelProcessor* processor, size_t processingSizeInFrames)
     : AudioDSPKernel(processor)
     , m_writeIndex(0)
     , m_firstTime(true)
     , m_delayTimes(processingSizeInFrames)
 {
 }
 
 AudioDelayDSPKernel::AudioDelayDSPKernel(double maxDelayTime, float sampleRate)
     : AudioDSPKernel(sampleRate)
     , m_maxDelayTime(maxDelayTime)
     , m_writeIndex(0)
     , m_firstTime(true)
 {
-    ASSERT(maxDelayTime > 0.0);
-    if (maxDelayTime <= 0.0)
+    ASSERT(maxDelayTime > 0.0 && !std::isnan(maxDelayTime));
+    if (maxDelayTime <= 0.0 || std::isnan(maxDelayTime))
         return;
 
     size_t bufferLength = bufferLengthForDelay(maxDelayTime, sampleRate);
     ASSERT(bufferLength);
     if (!bufferLength)
         return;
 
     m_buffer.allocate(bufferLength);
     m_buffer.zero();
 
@@ skipping 106 matching lines @@
 }
 
 double AudioDelayDSPKernel::latencyTime() const
 {
     return 0;
 }
 
 } // namespace WebCore
 
 #endif // ENABLE(WEB_AUDIO)