From 13a461831ab85ec9f55806ebf2df5ffb7f3f357a Mon Sep 17 00:00:00 2001
From: Rich Salz <rsalz@openssl.org>
Date: Fri, 2 Sep 2016 17:34:31 -0400
Subject: [PATCH] RT3669: dgst can only sign/verify one file.

Check arg count and print an error message.

Reviewed-by: Richard Levitte <levitte@openssl.org>
---
 apps/dgst.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/apps/dgst.c b/apps/dgst.c
index e438b7c8cc..b10b93e588 100644
--- a/apps/dgst.c
+++ b/apps/dgst.c
@@ -185,6 +185,10 @@ int dgst_main(int argc, char **argv)
     }
     argc = opt_num_rest();
     argv = opt_rest();
+    if (keyfile != NULL && argc > 1) {
+        BIO_printf(bio_err, "%s: Can only sign or verify one file.\n", prog);
+        goto end;
+    }
 
     if (do_verify && !sigfile) {
         BIO_printf(bio_err,