Merge 94265 - Do more rigorous bounds checking in AudioBufferSourceNode::renderFromBuffer()

Source/WebCore/webaudio/AudioBufferSourceNode.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 165 matching lines @@
     float* destinationL = bus->channel(0)->data();
     ASSERT(destinationL);
     if (!destinationL)
         return;
     float* destinationR = (numberOfChannels < 2) ? 0 : bus->channel(1)->data();
     
     bool isStereo = destinationR;
     
     // Sanity check destinationFrameOffset, numberOfFrames.
     size_t destinationLength = bus->length();
+
+    bool isLengthGood = destinationLength <= 4096 && numberOfFrames <= 4096;
+    ASSERT(isLengthGood);
+    if (!isLengthGood)
+        return;
+
     bool isOffsetGood = destinationFrameOffset <= destinationLength && destinationFrameOffset + numberOfFrames <= destinationLength;
     ASSERT(isOffsetGood);
     if (!isOffsetGood)
         return;
         
     // Potentially zero out initial frames leading up to the offset.
     if (destinationFrameOffset) {
         memset(destinationL, 0, sizeof(float) * destinationFrameOffset);
         if (destinationR)
             memset(destinationR, 0, sizeof(float) * destinationFrameOffset);
@@ skipping 228 matching lines @@
     ASSERT(isTotalRateValid);
     if (!isTotalRateValid)
         totalRate = 1.0;
     
     return totalRate;
 }
 
 } // namespace WebCore
 
 #endif // ENABLE(WEB_AUDIO)