static int asf_deinterleave(AVFormatContext *s, ASFPacket *asf_pkt, int st_num)
{
    ASFContext *asf    = s->priv_data;
    ASFStream *asf_st  = asf->asf_st[st_num];
    unsigned char *p   = asf_pkt->avpkt.data;
    uint16_t pkt_len   = asf->asf_st[st_num]->virtual_pkt_len;
    uint16_t chunk_len = asf->asf_st[st_num]->virtual_chunk_len;
    int nchunks        = pkt_len / chunk_len;
    AVPacket pkt;
    int pos = 0, j, l, ret;


    if ((ret = av_new_packet(&pkt, asf_pkt->data_size)) < 0)
        return ret;

    while (asf_pkt->data_size >= asf_st->span * pkt_len + pos) {
        if (pos >= asf_pkt->data_size) {
            break;
        }
        for (l = 0; l < pkt_len; l++) {
            if (pos >= asf_pkt->data_size) {
                break;
            }
            for (j = 0; j < asf_st->span; j++) {
                if ((pos + chunk_len) >= asf_pkt->data_size)
                    break;
                memcpy(pkt.data + pos,
                       p + (j * nchunks + l) * chunk_len,
                       chunk_len);
                pos += chunk_len;
            }
        }
        p += asf_st->span * pkt_len;
        if (p > asf_pkt->avpkt.data + asf_pkt->data_size)
            break;
    }
    av_packet_unref(&asf_pkt->avpkt);
    asf_pkt->avpkt = pkt;

    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.