From 98fca774b62f35b0618c01430e424ca43c492e34 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ond=C5=99ej=20Sur=C3=BD?= <ondrej@isc.org>
Date: Wed, 7 Dec 2022 16:45:33 +0100
Subject: [PATCH] Release unused key file IO lock objects

Due to off-by-one error in zonemgr_keymgmt_delete, unused key file IO
lock objects were never freed and they were kept until the server
shutdown.  Adjust the returned value by -1 to accomodate the fact that
the atomic_fetch_*() functions return the value before the operation and
not current value after the operation.

(cherry picked from commit fb1acd6736609360f79a498d44dffcceb8ca0f54)
---
 lib/dns/zone.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/dns/zone.c b/lib/dns/zone.c
index 2456cd23be..22ffc73b63 100644
--- a/lib/dns/zone.c
+++ b/lib/dns/zone.c
@@ -18656,7 +18656,7 @@ zonemgr_keymgmt_delete(dns_zonemgr_t *zmgr, dns_zone_t *zone) {
 		if (dns_name_equal(kfio->name, &zone->origin)) {
 			unsigned int count;
 
-			count = atomic_fetch_sub_relaxed(&kfio->count, 1);
+			count = atomic_fetch_sub_relaxed(&kfio->count, 1) - 1;
 			if (count > 0) {
 				/* Keep the entry. */
 				break;
-- 
2.23.0