From: Miroslav Lichvar <mlichvar@redhat.com>
Date: Wed, 14 Apr 2021 10:36:28 +0000 (+0200)
Subject: ntp: clamp remote stratum
X-Git-Tag: 4.1-pre1~16
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=635a9d3f5a7c7ed35bf11c57105252ce8cbccfa6;p=thirdparty%2Fchrony.git

ntp: clamp remote stratum

Don't set the remote stratum (used for polling adjustments) to values
larger than 16.
---

diff --git a/ntp_core.c b/ntp_core.c
index 37423329..51c11fd1 100644
--- a/ntp_core.c
+++ b/ntp_core.c
@@ -1759,7 +1759,7 @@ process_response(NCR_Instance inst, NTP_Local_Address *local_addr,
   if (valid_packet) {
     inst->remote_poll = message->poll;
     inst->remote_stratum = message->stratum != NTP_INVALID_STRATUM ?
-                           message->stratum : NTP_MAX_STRATUM;
+                           MIN(message->stratum, NTP_MAX_STRATUM) : NTP_MAX_STRATUM;
 
     inst->prev_local_poll = inst->local_poll;
     inst->prev_tx_count = inst->tx_count;