l2tp_proto_ver_print(netdissect_options *ndo, const uint16_t *dat)
{
	ND_PRINT((ndo, "%u.%u", (EXTRACT_16BITS(dat) >> 8),
	    (EXTRACT_16BITS(dat) & 0xff)));
}
The software reads data past the end, or before the beginning, of the intended buffer.