  tt_cmap13_char_index( TT_CMap    cmap,
                        FT_UInt32  char_code )
  {
    return tt_cmap13_char_map_binary( cmap, &char_code, 0 );
  }

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.