static boolean t1_open_fontfile(int open_name_prefix)
{
    ff_entry *ff;
    int callback_id = 0;
    int file_opened = 0;
    t1_curbyte = 0;
    t1_size = 0;
    ff = check_ff_exist(fd_cur->fm->ff_name, is_truetype(fd_cur->fm));
    if (ff->ff_path == NULL) {
        formatted_error("type 1","cannot open file for reading '%s'",fd_cur->fm->ff_name);
        return false;
    }
    cur_file_name = luatex_find_file(ff->ff_path, find_type1_file_callback);
    if (cur_file_name == NULL) {
        formatted_error("type 1","cannot open file for reading '%s'", ff->ff_path);
        return false;
    }
    callback_id = callback_defined(read_type1_file_callback);
    if (callback_id > 0) {
        if (!run_callback(callback_id, "S->bSd", cur_file_name, &file_opened, &t1_buffer, &t1_size)
            && file_opened && t1_size > 0) {
            formatted_warning("type 1","cannot open file for reading '%s'",cur_file_name);
            return false;
        }
    } else {
        t1_file = xfopen(cur_file_name, FOPEN_RBIN_MODE);
        t1_read_file();
        t1_close();
    }
    recorder_record_input(cur_file_name);
    t1_init_params(open_name_prefix);
    return true;
}

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.