From: Miroslav Lichvar <mlichvar@redhat.com>
Date: Wed, 1 Dec 2021 08:14:34 +0000 (+0100)
Subject: reference: check for unset leap_when in is_leap_close()
X-Git-Tag: 4.2-pre1~5
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=89a5e21e4d9765ba1339c20af8fbb48653506800;p=thirdparty%2Fchrony.git

reference: check for unset leap_when in is_leap_close()

Check that the leap_when variable is set before testing a timestamp for
being close to a leap second. This allows the first measurement to be
accepted if starting at the Unix epoch (e.g. in a test).
---

diff --git a/reference.c b/reference.c
index bf309916..90323230 100644
--- a/reference.c
+++ b/reference.c
@@ -1333,7 +1333,8 @@ REF_DisableLocal(void)
 static int
 is_leap_close(time_t t)
 {
-  return t >= leap_when - LEAP_SECOND_CLOSE && t < leap_when + LEAP_SECOND_CLOSE;
+  return leap_when != 0 &&
+         t >= leap_when - LEAP_SECOND_CLOSE && t < leap_when + LEAP_SECOND_CLOSE;
 }
 
 /* ================================================== */