void vmxnet_tx_pkt_update_ip_checksums(struct VmxnetTxPkt *pkt)
{
    uint16_t csum;
    uint32_t ph_raw_csum;
    assert(pkt);
    uint8_t gso_type = pkt->virt_hdr.gso_type & ~VIRTIO_NET_HDR_GSO_ECN;
    struct ip_header *ip_hdr;

    if (VIRTIO_NET_HDR_GSO_TCPV4 != gso_type &&
        VIRTIO_NET_HDR_GSO_UDP != gso_type) {
        return;
    }

    ip_hdr = pkt->vec[VMXNET_TX_PKT_L3HDR_FRAG].iov_base;

    if (pkt->payload_len + pkt->vec[VMXNET_TX_PKT_L3HDR_FRAG].iov_len >
        ETH_MAX_IP_DGRAM_LEN) {
        return;
    }

    ip_hdr->ip_len = cpu_to_be16(pkt->payload_len +
        pkt->vec[VMXNET_TX_PKT_L3HDR_FRAG].iov_len);

    /* Calculate IP header checksum                    */
    ip_hdr->ip_sum = 0;
    csum = net_raw_checksum((uint8_t *)ip_hdr,
        pkt->vec[VMXNET_TX_PKT_L3HDR_FRAG].iov_len);
    ip_hdr->ip_sum = cpu_to_be16(csum);

    /* Calculate IP pseudo header checksum             */
    ph_raw_csum = eth_calc_pseudo_hdr_csum(ip_hdr, pkt->payload_len);
    csum = cpu_to_be16(~net_checksum_finish(ph_raw_csum));
    iov_from_buf(&pkt->vec[VMXNET_TX_PKT_PL_START_FRAG], pkt->payload_frags,
                 pkt->virt_hdr.csum_offset, &csum, sizeof(csum));
}

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.