png_write_oFFs(png_structp png_ptr, png_int_32 x_offset, png_int_32 y_offset,
   int unit_type)
{
#ifdef PNG_USE_LOCAL_ARRAYS
   PNG_oFFs;
#endif
   png_byte buf[9];

   png_debug(1, "in png_write_oFFs");

   if (unit_type >= PNG_OFFSET_LAST)
      png_warning(png_ptr, "Unrecognized unit type for oFFs chunk");

   png_save_int_32(buf, x_offset);
   png_save_int_32(buf + 4, y_offset);
   buf[8] = (png_byte)unit_type;

   png_write_chunk(png_ptr, (png_bytep)png_oFFs, buf, (png_size_t)9);
}

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.