systemd/0113-timesyncd-check-if-stratum-is-valid.patch

From 07610e108e2d3f046da683a3a69c4d5cccd2cf8e Mon Sep 17 00:00:00 2001
From: Miroslav Lichvar <mlichvar@redhat.com>
Date: Wed, 27 Aug 2014 16:47:17 +0200
Subject: [PATCH] timesyncd: check if stratum is valid

---
 src/timesync/timesyncd-manager.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/timesync/timesyncd-manager.c b/src/timesync/timesyncd-manager.c
index d80c72ff5c..60f39c638d 100644
--- a/src/timesync/timesyncd-manager.c
+++ b/src/timesync/timesyncd-manager.c
@@ -574,7 +574,8 @@ static int manager_receive_response(sd_event_source *source, int fd, uint32_t re
                 return manager_connect(m);
         }
 
-        if (NTP_FIELD_LEAP(ntpmsg.field) == NTP_LEAP_NOTINSYNC) {
+        if (NTP_FIELD_LEAP(ntpmsg.field) == NTP_LEAP_NOTINSYNC ||
+            ntpmsg.stratum == 0 || ntpmsg.stratum >= 16) {
                 log_debug("Server is not synchronized. Disconnecting.");
                 return manager_connect(m);
         }