static int mov_read_stts(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    AVStream *st;
    MOVStreamContext *sc;
    unsigned int i, entries;
    int64_t duration=0;
    int64_t total_sample_count=0;

    if (c->fc->nb_streams < 1)
        return 0;
    st = c->fc->streams[c->fc->nb_streams-1];
    sc = st->priv_data;

    avio_r8(pb); /* version */
    avio_rb24(pb); /* flags */
    entries = avio_rb32(pb);

    av_dlog(c->fc, "track[%i].stts.entries = %i\n",
            c->fc->nb_streams-1, entries);

    if (entries >= UINT_MAX / sizeof(*sc->stts_data))
        return -1;

    sc->stts_data = av_malloc(entries * sizeof(*sc->stts_data));
    if (!sc->stts_data)
        return AVERROR(ENOMEM);

    sc->stts_count = entries;

    for (i=0; i<entries; i++) {
        int sample_duration;
        int sample_count;

        sample_count=avio_rb32(pb);
        sample_duration = avio_rb32(pb);
        /* sample_duration < 0 is invalid based on the spec */
        if (sample_duration < 0) {
            av_log(c->fc, AV_LOG_ERROR, "Invalid SampleDelta in STTS %d\n", sample_duration);
            sample_duration = 1;
        }
        sc->stts_data[i].count= sample_count;
        sc->stts_data[i].duration= sample_duration;

        av_dlog(c->fc, "sample_count=%d, sample_duration=%d\n",
                sample_count, sample_duration);

        duration+=(int64_t)sample_duration*sample_count;
        total_sample_count+=sample_count;
    }

    st->nb_frames= total_sample_count;
    if (duration)
        st->duration= duration;
    sc->track_end = duration;
    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.