xps_true_callback_encode_char(gs_font *pfont, gs_char chr, gs_glyph_space_t spc)
{
    xps_font_t *font = pfont->client_data;
    int value;

    value = xps_encode_font_char(font, chr);
    if (value == 0)
        return GS_NO_GLYPH;
    return value;
}

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.