static void PushRunlengthPacket(Image *image,const unsigned char *pixels,
  size_t *length,PixelPacket *pixel,IndexPacket *index)
{
  const unsigned char
    *p;

  p=pixels;
  if (image->storage_class == PseudoClass)
    {
      *index=(IndexPacket) 0;
      switch (image->depth)
      {
        case 32:
        {
          *index=ConstrainColormapIndex(image,((size_t) *p << 24) |
            ((size_t) *(p+1) << 16) | ((size_t) *(p+2) << 8) | (size_t) *(p+3));
          p+=4;
          break;
        }
        case 16:
        {
          *index=ConstrainColormapIndex(image,(*p << 8) | *(p+1));
          p+=2;
          break;
        }
        case 8:
        {
          *index=ConstrainColormapIndex(image,*p);
          p++;
          break;
        }
        default:
          (void) ThrowMagickException(&image->exception,GetMagickModule(),
            CorruptImageError,"ImageDepthNotSupported","`%s'",image->filename);
      }
      *pixel=image->colormap[(ssize_t) *index];
      switch (image->depth)
      {
        case 8:
        {
          unsigned char
            quantum;

          if (image->matte != MagickFalse)
            {
              p=PushCharPixel(p,&quantum);
              pixel->opacity=ScaleCharToQuantum(quantum);
            }
          break;
        }
        case 16:
        {
          unsigned short
            quantum;

          if (image->matte != MagickFalse)
            {
              p=PushShortPixel(MSBEndian,p,&quantum);
              pixel->opacity=(Quantum) (quantum >> (image->depth-
                MAGICKCORE_QUANTUM_DEPTH));
            }
          break;
        }
        case 32:
        {
          unsigned int
            quantum;

          if (image->matte != MagickFalse)
            {
              p=PushLongPixel(MSBEndian,p,&quantum);
              pixel->opacity=(Quantum) (quantum >> (image->depth-
                MAGICKCORE_QUANTUM_DEPTH));
            }
          break;
        }
        default:
          (void) ThrowMagickException(&image->exception,GetMagickModule(),
            CorruptImageError,"ImageDepthNotSupported","`%s'",image->filename);
      }
      *length=(size_t) (*p++)+1;
      return;
    }
  switch (image->depth)
  {
    case 8:
    {
      unsigned char
        quantum;

      p=PushCharPixel(p,&quantum);
      SetPixelRed(pixel,ScaleCharToQuantum(quantum));
      SetPixelGreen(pixel,ScaleCharToQuantum(quantum));
      SetPixelBlue(pixel,ScaleCharToQuantum(quantum));
      if (IsGrayColorspace(image->colorspace) == MagickFalse)
        {
          p=PushCharPixel(p,&quantum);
          SetPixelGreen(pixel,ScaleCharToQuantum(quantum));
          p=PushCharPixel(p,&quantum);
          SetPixelBlue(pixel,ScaleCharToQuantum(quantum));
        }
      if (image->colorspace == CMYKColorspace)
        {
          p=PushCharPixel(p,&quantum);
          SetPixelBlack(index,ScaleCharToQuantum(quantum));
        }
      if (image->matte != MagickFalse)
        {
          p=PushCharPixel(p,&quantum);
          SetPixelOpacity(pixel,ScaleCharToQuantum(quantum));
        }
      break;
    }
    case 16:
    {
      unsigned short
        quantum;

      p=PushShortPixel(MSBEndian,p,&quantum);
      SetPixelRed(pixel,quantum >> (image->depth-MAGICKCORE_QUANTUM_DEPTH));
      SetPixelGreen(pixel,ScaleCharToQuantum(quantum));
      SetPixelBlue(pixel,ScaleCharToQuantum(quantum));
      if (IsGrayColorspace(image->colorspace) == MagickFalse)
        {
          p=PushShortPixel(MSBEndian,p,&quantum);
          SetPixelGreen(pixel,quantum >> (image->depth-
            MAGICKCORE_QUANTUM_DEPTH));
          p=PushShortPixel(MSBEndian,p,&quantum);
          SetPixelBlue(pixel,quantum >> (image->depth-
            MAGICKCORE_QUANTUM_DEPTH));
        }
      if (image->colorspace == CMYKColorspace)
        {
          p=PushShortPixel(MSBEndian,p,&quantum);
          SetPixelBlack(index,quantum >> (image->depth-
            MAGICKCORE_QUANTUM_DEPTH));
        }
      if (image->matte != MagickFalse)
        {
          p=PushShortPixel(MSBEndian,p,&quantum);
          SetPixelOpacity(pixel,quantum >> (image->depth-
            MAGICKCORE_QUANTUM_DEPTH));
        }
      break;
    }
    case 32:
    {
      unsigned int
        quantum;

      p=PushLongPixel(MSBEndian,p,&quantum);
      SetPixelRed(pixel,quantum >> (image->depth-MAGICKCORE_QUANTUM_DEPTH));
      SetPixelGreen(pixel,ScaleCharToQuantum(quantum));
      SetPixelBlue(pixel,ScaleCharToQuantum(quantum));
      if (IsGrayColorspace(image->colorspace) == MagickFalse)
        {
          p=PushLongPixel(MSBEndian,p,&quantum);
          SetPixelGreen(pixel,quantum >> (image->depth-
            MAGICKCORE_QUANTUM_DEPTH));
          p=PushLongPixel(MSBEndian,p,&quantum);
          SetPixelBlue(pixel,quantum >> (image->depth-
            MAGICKCORE_QUANTUM_DEPTH));
        }
      if (image->colorspace == CMYKColorspace)
        {
          p=PushLongPixel(MSBEndian,p,&quantum);
          SetPixelIndex(index,quantum >> (image->depth-
            MAGICKCORE_QUANTUM_DEPTH));
        }
      if (image->matte != MagickFalse)
        {
          p=PushLongPixel(MSBEndian,p,&quantum);
          SetPixelOpacity(pixel,quantum >> (image->depth-
            MAGICKCORE_QUANTUM_DEPTH));
        }
      break;
    }
    default:
      (void) ThrowMagickException(&image->exception,GetMagickModule(),
        CorruptImageError,"ImageDepthNotSupported","`%s'",image->filename);
  }
  *length=(size_t) (*p++)+1;
}

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.