static Image *ReadSCTImage(const ImageInfo *image_info,ExceptionInfo *exception)
{
  char
    magick[2];

  Image
    *image;

  MagickBooleanType
    status;

  MagickRealType
    height,
    width;

  Quantum
    pixel;

  register IndexPacket
    *indexes;

  register ssize_t
    i,
    x;

  register PixelPacket
    *q;

  ssize_t
    count,
    y;

  unsigned char
    buffer[768];

  size_t
    separations,
    separations_mask,
    units;

  /*
    Open image file.
  */
  assert(image_info != (const ImageInfo *) NULL);
  assert(image_info->signature == MagickSignature);
  if (image_info->debug != MagickFalse)
    (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
      image_info->filename);
  assert(exception != (ExceptionInfo *) NULL);
  assert(exception->signature == MagickSignature);
  image=AcquireImage(image_info);
  status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
  if (status == MagickFalse)
    {
      image=DestroyImageList(image);
      return((Image *) NULL);
    }
  /*
    Read control block.
  */
  count=ReadBlob(image,80,buffer);
  (void) count;
  count=ReadBlob(image,2,(unsigned char *) magick);
  if ((LocaleNCompare((char *) magick,"CT",2) != 0) &&
      (LocaleNCompare((char *) magick,"LW",2) != 0) &&
      (LocaleNCompare((char *) magick,"BM",2) != 0) &&
      (LocaleNCompare((char *) magick,"PG",2) != 0) &&
      (LocaleNCompare((char *) magick,"TX",2) != 0))
    ThrowReaderException(CorruptImageError,"ImproperImageHeader");
  if ((LocaleNCompare((char *) magick,"LW",2) == 0) ||
      (LocaleNCompare((char *) magick,"BM",2) == 0) ||
      (LocaleNCompare((char *) magick,"PG",2) == 0) ||
      (LocaleNCompare((char *) magick,"TX",2) == 0))
    ThrowReaderException(CoderError,"OnlyContinuousTonePictureSupported");
  count=ReadBlob(image,174,buffer);
  count=ReadBlob(image,768,buffer);
  /*
    Read paramter block.
  */
  units=1UL*ReadBlobByte(image);
  if (units == 0)
    image->units=PixelsPerCentimeterResolution;
  separations=1UL*ReadBlobByte(image);
  separations_mask=ReadBlobMSBShort(image);
  count=ReadBlob(image,14,buffer);
  buffer[14]='\0';
  height=StringToDouble((char *) buffer,(char **) NULL);
  count=ReadBlob(image,14,buffer);
  width=StringToDouble((char *) buffer,(char **) NULL);
  count=ReadBlob(image,12,buffer);
  buffer[12]='\0';
  image->rows=StringToUnsignedLong((char *) buffer);
  count=ReadBlob(image,12,buffer);
  image->columns=StringToUnsignedLong((char *) buffer);
  count=ReadBlob(image,200,buffer);
  count=ReadBlob(image,768,buffer);
  if (separations_mask == 0x0f)
    SetImageColorspace(image,CMYKColorspace);
  image->x_resolution=1.0*image->columns/width;
  image->y_resolution=1.0*image->rows/height;
  if (image_info->ping != MagickFalse)
    {
       (void) CloseBlob(image);
       return(GetFirstImageInList(image));
     }
  status=SetImageExtent(image,image->columns,image->rows);
  if (status == MagickFalse)
    {
      InheritException(exception,&image->exception);
      return(DestroyImageList(image));
    }
   /*
     Convert SCT raster image to pixel packets.
   */
  for (y=0; y < (ssize_t) image->rows; y++)
  {
    for (i=0; i < (ssize_t) separations; i++)
    {
      q=GetAuthenticPixels(image,0,y,image->columns,1,exception);
      if (q == (PixelPacket *) NULL)
        break;
      indexes=GetAuthenticIndexQueue(image);
      for (x=0; x < (ssize_t) image->columns; x++)
      {
        pixel=(Quantum) ScaleCharToQuantum((unsigned char) ReadBlobByte(image));
        if (image->colorspace == CMYKColorspace)
          pixel=(Quantum) (QuantumRange-pixel);
        switch (i)
        {
          case 0:
          {
            SetPixelRed(q,pixel);
            SetPixelGreen(q,pixel);
            SetPixelBlue(q,pixel);
            break;
          }
          case 1:
          {
            SetPixelGreen(q,pixel);
            break;
          }
          case 2:
          {
            SetPixelBlue(q,pixel);
            break;
          }
          case 3:
          {
            if (image->colorspace == CMYKColorspace)
              SetPixelBlack(indexes+x,pixel);
            break;
          }
        }
        q++;
      }
      if (SyncAuthenticPixels(image,exception) == MagickFalse)
        break;
      if ((image->columns % 2) != 0)
        (void) ReadBlobByte(image);  /* pad */
    }
    status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
      image->rows);
    if (status == MagickFalse)
      break;
  }
  if (EOFBlob(image) != MagickFalse)
    ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
      image->filename);
  (void) CloseBlob(image);
  return(GetFirstImageInList(image));
}

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.