static bool net_tx_pkt_do_sw_fragmentation(struct NetTxPkt *pkt,
    NetClientState *nc)
{
    struct iovec fragment[NET_MAX_FRAG_SG_LIST];
    size_t fragment_len = 0;
    bool more_frags = false;

    /* some pointers for shorter code */
    void *l2_iov_base, *l3_iov_base;
    size_t l2_iov_len, l3_iov_len;
    int src_idx =  NET_TX_PKT_PL_START_FRAG, dst_idx;
    size_t src_offset = 0;
    size_t fragment_offset = 0;

    l2_iov_base = pkt->vec[NET_TX_PKT_L2HDR_FRAG].iov_base;
    l2_iov_len = pkt->vec[NET_TX_PKT_L2HDR_FRAG].iov_len;
    l3_iov_base = pkt->vec[NET_TX_PKT_L3HDR_FRAG].iov_base;
    l3_iov_len = pkt->vec[NET_TX_PKT_L3HDR_FRAG].iov_len;

    /* Copy headers */
    fragment[NET_TX_PKT_FRAGMENT_L2_HDR_POS].iov_base = l2_iov_base;
    fragment[NET_TX_PKT_FRAGMENT_L2_HDR_POS].iov_len = l2_iov_len;
    fragment[NET_TX_PKT_FRAGMENT_L3_HDR_POS].iov_base = l3_iov_base;
    fragment[NET_TX_PKT_FRAGMENT_L3_HDR_POS].iov_len = l3_iov_len;


    /* Put as much data as possible and send */
    do {
        fragment_len = net_tx_pkt_fetch_fragment(pkt, &src_idx, &src_offset,
            fragment, &dst_idx);

        more_frags = (fragment_offset + fragment_len < pkt->payload_len);

        eth_setup_ip4_fragmentation(l2_iov_base, l2_iov_len, l3_iov_base,
            l3_iov_len, fragment_len, fragment_offset, more_frags);

        eth_fix_ip4_checksum(l3_iov_base, l3_iov_len);

        net_tx_pkt_sendv(pkt, nc, fragment, dst_idx);

        fragment_offset += fragment_len;

    } while (fragment_len && more_frags);

    return true;
}

The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.