int ff_h264_handle_frag_packet(AVPacket *pkt, const uint8_t *buf, int len,
                               int start_bit, const uint8_t *nal_header,
                               int nal_header_len)
{
    int ret;
    int tot_len = len;
    int pos = 0;
    if (start_bit)
        tot_len += sizeof(start_sequence) + nal_header_len;
    if ((ret = av_new_packet(pkt, tot_len)) < 0)
        return ret;
    if (start_bit) {
        memcpy(pkt->data + pos, start_sequence, sizeof(start_sequence));
        pos += sizeof(start_sequence);
        memcpy(pkt->data + pos, nal_header, nal_header_len);
        pos += nal_header_len;
    }
    memcpy(pkt->data + pos, buf, len);
    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.