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diff -up dhcp-4.2.4/common/dispatch.c.foo dhcp-4.2.4/common/dispatch.c
--- dhcp-4.2.4/common/dispatch.c.foo 2012-07-26 21:31:43.875349675 -0500
+++ dhcp-4.2.4/common/dispatch.c 2012-07-26 21:39:14.961710319 -0500
@@ -324,7 +324,20 @@ void add_timeout (when, where, what, ref
q->next = timeouts;
timeouts = q;
- isc_interval_set(&interval, sec & DHCP_SEC_MAX, usec * 1000);
+ /* isc_time_nowplusinterval() is not safe with 64-bit time_t and will
+ * return an error for sufficiently large intervals. We have to limit
+ * the interval to INT_MAX or less to ensure the interval doesn't
+ * overflow 32 bits, since the returned isc_time_t fields are
+ * 32-bit unsigned ints.
+ *
+ * HACK: The 9 is a magic number of seconds, since some time may have
+ * gone by since the last call to gettimeofday() and the one in
+ * isc_time_nowplusinterval().
+ */
+ if (sec > TIME_MAX)
+ sec = TIME_MAX - 9;
+
+ isc_interval_set(&interval, sec, usec * 1000);
status = isc_time_nowplusinterval(&expires, &interval);
if (status != ISC_R_SUCCESS) {
/*