From e3c628d56228aca637dda77c1e568153d8995afc Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ond=C5=99ej=20Sur=C3=BD?= <ondrej@isc.org>
Date: Thu, 1 Dec 2022 18:31:05 +0100
Subject: [PATCH] Honour single read per client isc_nm_read() call in the
 TLSDNS

The TLSDNS transport was not honouring the single read callback for
TLSDNS client.  It would call the read callbacks repeatedly in case the
single TLS read would result in multiple DNS messages in the decoded
buffer.
---
 lib/isc/netmgr/tlsdns.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/isc/netmgr/tlsdns.c b/lib/isc/netmgr/tlsdns.c
index db8d709580..0da0dfe7f1 100644
--- a/lib/isc/netmgr/tlsdns.c
+++ b/lib/isc/netmgr/tlsdns.c
@@ -1127,6 +1127,10 @@ tls_cycle_input(isc_nmsocket_t *sock) {
 				goto failure;
 			}
 
+			if (atomic_load(&sock->client)) {
+				break;
+			}
+
 			if (pending == 0) {
 				break;
 			}