void net_tx_pkt_setup_vlan_header_ex(struct NetTxPkt *pkt,
    uint16_t vlan, uint16_t vlan_ethtype)
{
    bool is_new;
    assert(pkt);

    eth_setup_vlan_headers_ex(pkt->vec[NET_TX_PKT_L2HDR_FRAG].iov_base,
        vlan, vlan_ethtype, &is_new);

    /* update l2hdrlen */
    if (is_new) {
        pkt->hdr_len += sizeof(struct vlan_header);
        pkt->vec[NET_TX_PKT_L2HDR_FRAG].iov_len +=
            sizeof(struct vlan_header);
    }
}

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.