From d528de9c6efbbc4ac901e0bc345ab13bab2536f9 Mon Sep 17 00:00:00 2001
From: Werner Koch <wk@gnupg.org>
Date: Tue, 17 Oct 2023 16:42:33 +0200
Subject: [PATCH] sm: Minor robustness fix for a regression test.

* sm/t-minip12.c (run_one_test): Don't hash if we have no parameters
at all.
--

This fix handles the case that an empty result array is returned by
minip12.c
---
 sm/t-minip12.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/sm/t-minip12.c b/sm/t-minip12.c
index 97d58d530..c9adcede6 100644
--- a/sm/t-minip12.c
+++ b/sm/t-minip12.c
@@ -539,7 +539,10 @@ run_one_test (const char *name, const char *desc, const char *pass,
             }
         }
 
-      resulthash = hash_buffer (tmpstring, strlen (tmpstring));
+      /* Hash only if we have at least one parameter; i.e. the curve
+       * alone is not sufficient.  */
+      if (result[0])
+        resulthash = hash_buffer (tmpstring, strlen (tmpstring));
       xfree (tmpstring);
     }