Check for NaN when creating a DelayNode for WebAudio

Source/modules/webaudio/DelayNode.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 13 matching lines @@
 
 #include "config.h"
 
 #if ENABLE(WEB_AUDIO)
 
 #include "modules/webaudio/DelayNode.h"
 
 #include "bindings/v8/ExceptionMessages.h"
 #include "bindings/v8/ExceptionState.h"
 #include "core/dom/ExceptionCode.h"
+#include "wtf/MathExtras.h"
 
 namespace WebCore {
 
 const double maximumAllowedDelayTime = 180;
 
 DelayNode::DelayNode(AudioContext* context, float sampleRate, double maxDelayTime, ExceptionState& exceptionState)
     : AudioBasicProcessorNode(context, sampleRate)
 {
     ScriptWrappable::init(this);
-    if (maxDelayTime <= 0 || maxDelayTime >= maximumAllowedDelayTime) {
+    if (maxDelayTime <= 0 || maxDelayTime >= maximumAllowedDelayTime || std::isnan(maxDelayTime)) {
         exceptionState.throwDOMException(
             NotSupportedError,
             "max delay time (" + String::number(maxDelayTime)
             + ") must be between 0 and " + String::number(maximumAllowedDelayTime)
             + ", exclusive.");
         return;
     }
     m_processor = adoptPtr(new DelayProcessor(context, sampleRate, 1, maxDelayTime));
     setNodeType(NodeTypeDelay);
 }
 
 AudioParam* DelayNode::delayTime()
 {
     return delayProcessor()->delayTime();
 }
 
 } // namespace WebCore
 
 #endif // ENABLE(WEB_AUDIO)