===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/ssh/canohost.c,v
retrieving revision 1.75
retrieving revision 1.76
diff -u -r1.75 -r1.76
--- src/usr.bin/ssh/canohost.c	2020/10/18 11:32:01	1.75
+++ src/usr.bin/ssh/canohost.c	2023/03/03 05:00:34	1.76
@@ -1,4 +1,4 @@
-/* $OpenBSD: canohost.c,v 1.75 2020/10/18 11:32:01 djm Exp $ */
+/* $OpenBSD: canohost.c,v 1.76 2023/03/03 05:00:34 djm Exp $ */
 /*
  * Author: Tatu Ylonen <ylo@cs.hut.fi>
  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@@ -43,6 +43,9 @@
 	socklen_t addrlen;
 	char ntop[NI_MAXHOST];
 	int r;
+
+	if (sock < 0)
+		return NULL;
 
 	/* Get IP address of client. */
 	addrlen = sizeof(addr);