ts_print(netdissect_options *ndo,
         register const struct timeval *tvp)
{
	register int s;
	struct tm *tm;
	time_t Time;
	char buf[TS_BUF_SIZE];
	static struct timeval tv_ref;
	struct timeval tv_result;
	int negative_offset;
	int nano_prec;

	switch (ndo->ndo_tflag) {

	case 0: /* Default */
		s = (tvp->tv_sec + thiszone) % 86400;
		ND_PRINT((ndo, "%s ", ts_format(ndo, s, tvp->tv_usec, buf)));
		break;

	case 1: /* No time stamp */
		break;

	case 2: /* Unix timeval style */
		ND_PRINT((ndo, "%s ", ts_unix_format(ndo,
			  tvp->tv_sec, tvp->tv_usec, buf)));
		break;

	case 3: /* Microseconds/nanoseconds since previous packet */
        case 5: /* Microseconds/nanoseconds since first packet */
#ifdef HAVE_PCAP_SET_TSTAMP_PRECISION
		switch (ndo->ndo_tstamp_precision) {
		case PCAP_TSTAMP_PRECISION_MICRO:
			nano_prec = 0;
			break;
		case PCAP_TSTAMP_PRECISION_NANO:
			nano_prec = 1;
			break;
		default:
			nano_prec = 0;
			break;
		}
#else
		nano_prec = 0;
#endif
		if (!(netdissect_timevalisset(&tv_ref)))
			tv_ref = *tvp; /* set timestamp for first packet */

		negative_offset = netdissect_timevalcmp(tvp, &tv_ref, <);
		if (negative_offset)
			netdissect_timevalsub(&tv_ref, tvp, &tv_result, nano_prec);
		else
			netdissect_timevalsub(tvp, &tv_ref, &tv_result, nano_prec);

		ND_PRINT((ndo, (negative_offset ? "-" : " ")));

		ND_PRINT((ndo, "%s ", ts_format(ndo,
			  tv_result.tv_sec, tv_result.tv_usec, buf)));

                if (ndo->ndo_tflag == 3)
			tv_ref = *tvp; /* set timestamp for previous packet */
		break;

	case 4: /* Default + Date */
		s = (tvp->tv_sec + thiszone) % 86400;
		Time = (tvp->tv_sec + thiszone) - s;
		tm = gmtime (&Time);
		if (!tm)
			ND_PRINT((ndo, "Date fail  "));
		else
			ND_PRINT((ndo, "%04d-%02d-%02d %s ",
                               tm->tm_year+1900, tm->tm_mon+1, tm->tm_mday,
                               ts_format(ndo, s, tvp->tv_usec, buf)));
		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.