netanalyzer_transparent_if_print(netdissect_options *ndo,
                                 const struct pcap_pkthdr *h,
                                 const u_char *p)
{
	/*
	 * Fail if we don't have enough data for the Hilscher pseudo-header,
	 * preamble, and SOF.
	 */
	if (h->len < 12 || h->caplen < 12) {
		ND_PRINT((ndo, "[|netanalyzer-transparent]"));
		return (h->caplen);
	}

	/* Skip the pseudo-header, preamble, and SOF. */
	return (12 + ether_print(ndo, p + 12, h->len - 12, h->caplen - 12, NULL, NULL));
}

The product reads data past the end, or before the beginning, of the intended buffer.