timesyncd: check if stratum is valid

diff --git a/src/timesync/timesyncd-manager.c b/src/timesync/timesyncd-manager.c
index d80c72ff5c1f077c85a0659f53c1260992ef848d..60f39c638d3bdd715cf6ca0cb7a720a392b19803 100644 (file)
--- 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);
         }
 
                 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);
         }
                 log_debug("Server is not synchronized. Disconnecting.");
                 return manager_connect(m);
         }