static bool vmxnet_tx_pkt_parse_headers(struct VmxnetTxPkt *pkt)
{
    struct iovec *l2_hdr, *l3_hdr;
    size_t bytes_read;
    size_t full_ip6hdr_len;
    uint16_t l3_proto;

    assert(pkt);

    l2_hdr = &pkt->vec[VMXNET_TX_PKT_L2HDR_FRAG];
    l3_hdr = &pkt->vec[VMXNET_TX_PKT_L3HDR_FRAG];

    bytes_read = iov_to_buf(pkt->raw, pkt->raw_frags, 0, l2_hdr->iov_base,
                            ETH_MAX_L2_HDR_LEN);
    if (bytes_read < sizeof(struct eth_header)) {
        l2_hdr->iov_len = 0;
        return false;
    }

    l2_hdr->iov_len = sizeof(struct eth_header);
    switch (be16_to_cpu(PKT_GET_ETH_HDR(l2_hdr->iov_base)->h_proto)) {
    case ETH_P_VLAN:
        l2_hdr->iov_len += sizeof(struct vlan_header);
        break;
    case ETH_P_DVLAN:
        l2_hdr->iov_len += 2 * sizeof(struct vlan_header);
        break;
    }

    if (bytes_read < l2_hdr->iov_len) {
        l2_hdr->iov_len = 0;
        return false;
    }

    l3_proto = eth_get_l3_proto(l2_hdr->iov_base, l2_hdr->iov_len);

    switch (l3_proto) {
    case ETH_P_IP:
        l3_hdr->iov_base = g_malloc(ETH_MAX_IP4_HDR_LEN);

        bytes_read = iov_to_buf(pkt->raw, pkt->raw_frags, l2_hdr->iov_len,
                                l3_hdr->iov_base, sizeof(struct ip_header));

        if (bytes_read < sizeof(struct ip_header)) {
            l3_hdr->iov_len = 0;
            return false;
         }
 
         l3_hdr->iov_len = IP_HDR_GET_LEN(l3_hdr->iov_base);
        if(l3_hdr->iov_len < sizeof(struct ip_header))
        {
            l3_hdr->iov_len = 0;
            return false;
        }
         pkt->l4proto = ((struct ip_header *) l3_hdr->iov_base)->ip_p;
 
         /* copy optional IPv4 header data */
            l3_hdr->iov_len = 0;
            return false;
        }
        break;

    case ETH_P_IPV6:
        if (!eth_parse_ipv6_hdr(pkt->raw, pkt->raw_frags, l2_hdr->iov_len,
                               &pkt->l4proto, &full_ip6hdr_len)) {
            l3_hdr->iov_len = 0;
            return false;
        }

        l3_hdr->iov_base = g_malloc(full_ip6hdr_len);

        bytes_read = iov_to_buf(pkt->raw, pkt->raw_frags, l2_hdr->iov_len,
                                l3_hdr->iov_base, full_ip6hdr_len);

        if (bytes_read < full_ip6hdr_len) {
            l3_hdr->iov_len = 0;
            return false;
        } else {
            l3_hdr->iov_len = full_ip6hdr_len;
        }
        break;

    default:
        l3_hdr->iov_len = 0;
        break;
    }

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.