png_handle_sRGB(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length)
{
   png_byte intent;

   png_debug(1, "in png_handle_sRGB");

   if ((png_ptr->mode & PNG_HAVE_IHDR) == 0)
      png_chunk_error(png_ptr, "missing IHDR");

   else if ((png_ptr->mode & (PNG_HAVE_IDAT|PNG_HAVE_PLTE)) != 0)
   {
      png_crc_finish(png_ptr, length);
      png_chunk_benign_error(png_ptr, "out of place");
      return;
   }

   if (length != 1)
   {
      png_crc_finish(png_ptr, length);
      png_chunk_benign_error(png_ptr, "invalid");
      return;
   }

   png_crc_read(png_ptr, &intent, 1);

   if (png_crc_finish(png_ptr, 0) != 0)
      return;

   /* If a colorspace error has already been output skip this chunk */
   if ((png_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) != 0)
      return;

   /* Only one sRGB or iCCP chunk is allowed, use the HAVE_INTENT flag to detect
    * this.
    */
   if ((png_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_INTENT) != 0)
   {
      png_ptr->colorspace.flags |= PNG_COLORSPACE_INVALID;
      png_colorspace_sync(png_ptr, info_ptr);
      png_chunk_benign_error(png_ptr, "too many profiles");
      return;
   }

   (void)png_colorspace_set_sRGB(png_ptr, &png_ptr->colorspace, intent);
   png_colorspace_sync(png_ptr, info_ptr);
}

The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.