static int mov_read_timecode_track(AVFormatContext *s, AVStream *st)
{
    MOVStreamContext *sc = st->priv_data;
    int flags = 0;
    int64_t cur_pos = avio_tell(sc->pb);
    uint32_t value;

    if (!st->nb_index_entries)
        return -1;

    avio_seek(sc->pb, st->index_entries->pos, SEEK_SET);
    value = avio_rb32(s->pb);

    if (sc->tmcd_flags & 0x0001) flags |= AV_TIMECODE_FLAG_DROPFRAME;
    if (sc->tmcd_flags & 0x0002) flags |= AV_TIMECODE_FLAG_24HOURSMAX;
    if (sc->tmcd_flags & 0x0004) flags |= AV_TIMECODE_FLAG_ALLOWNEGATIVE;

    /* Assume Counter flag is set to 1 in tmcd track (even though it is likely
     * not the case) and thus assume "frame number format" instead of QT one.
     * No sample with tmcd track can be found with a QT timecode at the moment,
     * despite what the tmcd track "suggests" (Counter flag set to 0 means QT
     * format). */
    parse_timecode_in_framenum_format(s, st, value, flags);

    avio_seek(sc->pb, cur_pos, SEEK_SET);
    return 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.