Check for NaN when creating a DelayNode for WebAudio

Source/modules/webaudio/DelayDSPKernel.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 "modules/webaudio/DelayDSPKernel.h"
 
 #include "platform/audio/AudioUtilities.h"
+#include "wtf/MathExtras.h"
 #include <algorithm>
 
 using namespace std;
 
 namespace WebCore {
 
 const float SmoothingTimeConstant = 0.020f; // 20ms
 
 DelayDSPKernel::DelayDSPKernel(DelayProcessor* processor)
     : AudioDelayDSPKernel(processor, AudioNode::ProcessingSizeInFrames)
 {
     ASSERT(processor && processor->sampleRate() > 0);
     if (!(processor && processor->sampleRate() > 0))
         return;
 
     m_maxDelayTime = processor->maxDelayTime();
-    ASSERT(m_maxDelayTime >= 0);
-    if (m_maxDelayTime < 0)
+    ASSERT(m_maxDelayTime >= 0 && !std::isnan(m_maxDelayTime));
+    if (m_maxDelayTime < 0 || std::isnan(m_maxDelayTime))
         return;
 
     m_buffer.allocate(bufferLengthForDelay(m_maxDelayTime, processor->sampleRate()));
     m_buffer.zero();
 
     m_smoothingRate = AudioUtilities::discreteTimeConstantForSampleRate(SmoothingTimeConstant, processor->sampleRate());
 }
 
 bool DelayDSPKernel::hasSampleAccurateValues()
 {
     return delayProcessor()->delayTime()->hasSampleAccurateValues();
 }
 
 void DelayDSPKernel::calculateSampleAccurateValues(float* delayTimes, size_t framesToProcess)
 {
     delayProcessor()->delayTime()->calculateSampleAccurateValues(delayTimes, framesToProcess);
 }
 
 double DelayDSPKernel::delayTime(float)
 {
     return delayProcessor()->delayTime()->finalValue();
 }
 
 } // namespace WebCore
 
 #endif // ENABLE(WEB_AUDIO)