From: Artem Boldariev <artem@boldariev.com>
Date: Tue, 18 Oct 2022 11:42:10 +0000 (+0300)
Subject: TLS Stream: handle successful TLS handshake after listener shutdown
X-Git-Tag: v9.19.7~47^2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=09dcc914b4c54d97d776c3f21b84ed842eda9206;p=thirdparty%2Fbind9.git

TLS Stream: handle successful TLS handshake after listener shutdown

It was possible that accept callback can be called after listener
shutdown. In such a case the callback pointer equals NULL, leading to
segmentation fault. This commit fixes that.
---

diff --git a/lib/isc/netmgr/tlsstream.c b/lib/isc/netmgr/tlsstream.c
index d99e842ca34..35fa09fec2c 100644
--- a/lib/isc/netmgr/tlsstream.c
+++ b/lib/isc/netmgr/tlsstream.c
@@ -341,7 +341,7 @@ tls_try_handshake(isc_nmsocket_t *sock, isc_result_t *presult) {
 		isc__nmsocket_log_tls_session_reuse(sock, sock->tlsstream.tls);
 		tlshandle = isc__nmhandle_get(sock, &sock->peer, &sock->iface);
 		if (sock->tlsstream.server) {
-			if (sock->listener->accept_cb == NULL) {
+			if (isc__nmsocket_closing(sock->listener)) {
 				result = ISC_R_CANCELED;
 			} else {
 				result = sock->listener->accept_cb(