guard against getsockname(-1, ...) from Coverity CID 291832

diff --git a/usr.bin/ssh/canohost.c b/usr.bin/ssh/canohost.c
index 406c5fd..3a73056 100644 (file)
--- a/usr.bin/ssh/canohost.c
+++ b/usr.bin/ssh/canohost.c
@@ -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
@@ -44,6 +44,9 @@ get_socket_address(int sock, int remote, int flags)
        char ntop[NI_MAXHOST];
        int r;
 
+       if (sock < 0)
+               return NULL;
+
        /* Get IP address of client. */
        addrlen = sizeof(addr);
        memset(&addr, 0, sizeof(addr));