From: Miroslav Lichvar <mlichvar@redhat.com>
Date: Mon, 8 Jun 2015 12:49:52 +0000 (+0200)
Subject: sched: detect timeout overflow in SCH_AddTimeoutByDelay()
X-Git-Tag: 2.1-pre1~10
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ea7fae5277c552c182bbadf44bbab3b6d7a5deb0;p=thirdparty%2Fchrony.git

sched: detect timeout overflow in SCH_AddTimeoutByDelay()

Abort when the system time gets so close to the end of 32-bit time_t
that timeouts added by delay start to overflow. This is an addition to
the loop detector in dispatch_timeouts().
---

diff --git a/sched.c b/sched.c
index bee30316..1946745c 100644
--- a/sched.c
+++ b/sched.c
@@ -330,6 +330,10 @@ SCH_AddTimeoutByDelay(double delay, SCH_TimeoutHandler handler, SCH_ArbitraryArg
 
   LCL_ReadRawTime(&now);
   UTI_AddDoubleToTimeval(&now, delay, &then);
+  if (UTI_CompareTimevals(&now, &then) > 0) {
+    LOG_FATAL(LOGF_Scheduler, "Timeout overflow");
+  }
+
   return SCH_AddTimeout(&then, handler, arg);
 
 }