bio_dump: only run strncmp if there's something to compare

1 files changed, 2 insertions, 2 deletions

diff --git a/src/regress/lib/libcrypto/bio/bio_dump.c b/src/regress/lib/libcrypto/bio/bio_dump.c
index 22db80fa3d..fd2bb285fb 100644
--- a/src/regress/lib/libcrypto/bio/bio_dump.c
+++ b/src/regress/lib/libcrypto/bio/bio_dump.c
@@ -1,4 +1,4 @@
-/*      $OpenBSD: bio_dump.c,v 1.4 2024/02/09 12:48:32 tb Exp $ */
+/*      $OpenBSD: bio_dump.c,v 1.5 2025/05/18 06:41:51 tb Exp $ */
 /*
  * Copyright (c) 2024 Theo Buehler <tb@openbsd.org>
  *
@@ -809,7 +809,7 @@ bio_dump_test(const struct bio_dump_testcase *tc)
                     tc->indent, ret, got_len, strlen(tc->output));
                 goto err;
         }
-        if (strncmp(tc->output, got, got_len) != 0) {
+        if (got_len > 0 && strncmp(tc->output, got, got_len) != 0) {
                 fprintf(stderr, "%d: mismatch\n", tc->indent);
                 goto err;
         }