MagickExport MagickBooleanType CLAHEImage(Image *image,const size_t width,
  const size_t height,const size_t number_bins,const double clip_limit,
  ExceptionInfo *exception)
{
#define CLAHEImageTag  "CLAHE/Image"

  CacheView
    *image_view;

  ColorspaceType
    colorspace;

  MagickBooleanType
    status;

  MagickOffsetType
    progress;

  MemoryInfo
    *pixel_cache;

  RangeInfo
    range_info;

  RectangleInfo
    clahe_info,
    tile_info;

  size_t
    n;

  ssize_t
    y;

  unsigned short
    *pixels;

  /*
    Configure CLAHE parameters.
  */
  assert(image != (Image *) NULL);
  assert(image->signature == MagickCoreSignature);
  if (image->debug != MagickFalse)
    (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
  range_info.min=0;
  range_info.max=NumberCLAHEGrays-1;
  tile_info.width=width;
  if (tile_info.width == 0)
    tile_info.width=image->columns >> 3;
  tile_info.height=height;
  if (tile_info.height == 0)
    tile_info.height=image->rows >> 3;
  tile_info.x=0;
  if ((image->columns % tile_info.width) != 0)
    tile_info.x=(ssize_t) tile_info.width-(image->columns % tile_info.width);
  tile_info.y=0;
  if ((image->rows % tile_info.height) != 0)
    tile_info.y=(ssize_t) tile_info.height-(image->rows % tile_info.height);
  clahe_info.width=image->columns+tile_info.x;
  clahe_info.height=image->rows+tile_info.y;
  clahe_info.x=(ssize_t) clahe_info.width/tile_info.width;
  clahe_info.y=(ssize_t) clahe_info.height/tile_info.height;
  pixel_cache=AcquireVirtualMemory(clahe_info.width,clahe_info.height*
    sizeof(*pixels));
  if (pixel_cache == (MemoryInfo *) NULL)
    ThrowBinaryException(ResourceLimitError,"MemoryAllocationFailed",
      image->filename);
  pixels=(unsigned short *) GetVirtualMemoryBlob(pixel_cache);
  colorspace=image->colorspace;
  if (TransformImageColorspace(image,LabColorspace,exception) == MagickFalse)
    {
      pixel_cache=RelinquishVirtualMemory(pixel_cache);
      return(MagickFalse);
    }
  /*
    Initialize CLAHE pixels.
  */
  image_view=AcquireVirtualCacheView(image,exception);
  progress=0;
  status=MagickTrue;
  n=0;
  for (y=0; y < (ssize_t) clahe_info.height; y++)
  {
    register const Quantum
      *magick_restrict p;

    register ssize_t
      x;

    if (status == MagickFalse)
      continue;
    p=GetCacheViewVirtualPixels(image_view,-(tile_info.x >> 1),y-
      (tile_info.y >> 1),clahe_info.width,1,exception);
    if (p == (const Quantum *) NULL)
      {
        status=MagickFalse;
        continue;
      }
    for (x=0; x < (ssize_t) clahe_info.width; x++)
    {
      pixels[n++]=ScaleQuantumToShort(p[0]);
      p+=GetPixelChannels(image);
    }
    if (image->progress_monitor != (MagickProgressMonitor) NULL)
      {
        MagickBooleanType
          proceed;

#if defined(MAGICKCORE_OPENMP_SUPPORT)
        #pragma omp atomic
#endif
        progress++;
        proceed=SetImageProgress(image,CLAHEImageTag,progress,2*
          GetPixelChannels(image));
        if (proceed == MagickFalse)
          status=MagickFalse;
      }
  }
  image_view=DestroyCacheView(image_view);
  status=CLAHE(&clahe_info,&tile_info,&range_info,number_bins == 0 ?
    (size_t) 128 : MagickMin(number_bins,256),clip_limit,pixels);
  if (status == MagickFalse)
    (void) ThrowMagickException(exception,GetMagickModule(),
      ResourceLimitError,"MemoryAllocationFailed","`%s'",image->filename);
  /*
    Push CLAHE pixels to CLAHE image.
  */
  image_view=AcquireAuthenticCacheView(image,exception);
  n=clahe_info.width*(tile_info.y >> 1);
  for (y=0; y < (ssize_t) image->rows; y++)
  {
    register Quantum
      *magick_restrict q;

    register ssize_t
      x;

    if (status == MagickFalse)
      continue;
    q=GetCacheViewAuthenticPixels(image_view,0,y,image->columns,1,exception);
    if (q == (Quantum *) NULL)
      {
        status=MagickFalse;
        continue;
      }
    n+=tile_info.x >> 1;
    for (x=0; x < (ssize_t) image->columns; x++)
    {
      q[0]=ScaleShortToQuantum(pixels[n++]);
      q+=GetPixelChannels(image);
    }
    n+=(clahe_info.width-image->columns-(tile_info.x >> 1));
    if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse)
      status=MagickFalse;
    if (image->progress_monitor != (MagickProgressMonitor) NULL)
      {
        MagickBooleanType
          proceed;

#if defined(MAGICKCORE_OPENMP_SUPPORT)
        #pragma omp atomic
#endif
        progress++;
        proceed=SetImageProgress(image,CLAHEImageTag,progress,2*
          GetPixelChannels(image));
        if (proceed == MagickFalse)
          status=MagickFalse;
      }
  }
  image_view=DestroyCacheView(image_view);
  pixel_cache=RelinquishVirtualMemory(pixel_cache);
  if (TransformImageColorspace(image,colorspace,exception) == MagickFalse)
    status=MagickFalse;
  return(status);
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.