From: Mark Andrews <marka@isc.org>
Date: Tue, 16 Jan 2024 14:25:27 +1100
Subject: Clear qctx->zversion

Clear qctx->zversion when clearing qctx->zrdataset et al in
lib/ns/query.c:qctx_freedata.  The uncleared pointer could lead to
an assertion failure if zone data needed to be re-saved which could
happen with stale data support enabled.

(cherry picked from commit 179fb3532ab8d4898ab070b2db54c0ce872ef709)
---
 lib/ns/query.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/ns/query.c b/lib/ns/query.c
index 1290c30..ec9bf5b 100644
--- a/lib/ns/query.c
+++ b/lib/ns/query.c
@@ -5260,6 +5260,7 @@ qctx_freedata(query_ctx_t *qctx) {
 		ns_client_releasename(qctx->client, &qctx->zfname);
 		dns_db_detachnode(qctx->zdb, &qctx->znode);
 		dns_db_detach(&qctx->zdb);
+		qctx->zversion = NULL;
 	}
 
 	if (qctx->event != NULL && !qctx->client->nodetach) {