upstream: allow UpdateKnownHosts=yes to function when multiple

known_hosts files are in use. When updating host keys, ssh will now search
subsequent known_hosts files, but will add new/changed host keys to the first
specified file only. bz#2738

ok markus@

OpenBSD-Commit-ID: 6ded6d878a03e57d5aa20bab9c31f92e929dbc6c

1 files changed, 2 insertions, 2 deletions

diff --git a/ssh.c b/ssh.c
index 8931ecf81..4998ebc16 100644
--- a/ssh.c
+++ b/ssh.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: ssh.c,v 1.514 2020/01/25 00:03:36 djm Exp $ */
+/* $OpenBSD: ssh.c,v 1.515 2020/01/25 00:21:08 djm Exp $ */
 /*
  * Author: Tatu Ylonen <ylo@cs.hut.fi>
  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@@ -1248,7 +1248,7 @@ main(int ac, char **av)
             strcmp(options.proxy_command, "-") == 0 &&
             options.proxy_use_fdpass)
                 fatal("ProxyCommand=- and ProxyUseFDPass are incompatible");
-        if (options.control_persist &&
+        if (options.control_persist && options.control_path != NULL &&
             options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
                 debug("UpdateHostKeys=ask is incompatible with ControlPersist; "
                     "disabling");