Description: Fix cookie crash
 This is a minimal fix for an NTS cookie crash.
Bug: https://gitlab.com/NTPsec/ntpsec/-/issues/794
Bug-Debian: https://bugs.debian.org/1038422
Origin: upstream, https://gitlab.com/NTPsec/ntpsec/-/issues/794#note_1483608766
Author: Hal Murray <halmurray@sonic.net>
Last-Update: 2023-07-29

--- a/ntpd/nts_cookie.c
+++ b/ntpd/nts_cookie.c
@@ -382,6 +382,9 @@
 	if (NULL == cookie_ctx)
 		return false;	/* We aren't initialized yet. */
 
+	if (0 == nts_nKeys)
+		return false;	/* No cookies.	We are not an NTS server. */
+
 	/* We may get garbage from the net */
 	if (cookielen > NTS_MAX_COOKIELEN)
 		return false;