bio chain test: ensure the length of empty chains is 0

diff --git a/regress/lib/libcrypto/bio/bio_chain.c b/regress/lib/libcrypto/bio/bio_chain.c
index 81b3b86..81f9b82 100644 (file)
--- a/regress/lib/libcrypto/bio/bio_chain.c
+++ b/regress/lib/libcrypto/bio/bio_chain.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: bio_chain.c,v 1.8 2022/12/09 07:46:54 tb Exp $        */
+/*     $OpenBSD: bio_chain.c,v 1.9 2022/12/09 07:47:59 tb Exp $        */
 /*
  * Copyright (c) 2022 Theo Buehler <tb@openbsd.org>
  *
@@ -200,8 +200,11 @@ walk_forward(BIO *start, BIO *end, size_t expected_len, size_t i, size_t j,
        size_t len;
        int ret = 0;
 
-       if (start == NULL || end == NULL)
+       if (start == NULL || end == NULL) {
+               if (expected_len != 0)
+                       goto err;
                goto done;
+       }
 
        next = start;
        len = 0;
@@ -240,8 +243,11 @@ walk_backward(BIO *start, BIO *end, size_t expected_len, size_t i, size_t j,
        size_t len;
        int ret = 0;
 
-       if (start == NULL || end == NULL)
+       if (start == NULL || end == NULL) {
+               if (expected_len != 0)
+                       goto err;
                goto done;
+       }
 
        prev = end;
        len = 0;