avoid NULL deref in -Y find-principals. Report and fix from

Carlo Marcelo Arenas Belón

diff --git a/usr.bin/ssh/ssh-keygen.c b/usr.bin/ssh/ssh-keygen.c
index c7992c9..9057f73 100644 (file)
--- a/usr.bin/ssh/ssh-keygen.c
+++ b/usr.bin/ssh/ssh-keygen.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: ssh-keygen.c,v 1.435 2021/08/11 08:54:17 djm Exp $ */
+/* $OpenBSD: ssh-keygen.c,v 1.436 2021/09/07 06:03:51 djm Exp $ */
 /*
  * Author: Tatu Ylonen <ylo@cs.hut.fi>
  * Copyright (c) 1994 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@@ -2657,7 +2657,8 @@ sig_process_opts(char * const *opts, size_t nopts, uint64_t *verify_timep,
        time_t now;
 
        *verify_timep = 0;
-       *print_pubkey = 0;
+       if (print_pubkey == NULL)
+               *print_pubkey = 0;
        for (i = 0; i < nopts; i++) {
                if (strncasecmp(opts[i], "verify-time=", 12) == 0) {
                        if (parse_absolute_time(opts[i] + 12,