1 files changed, 19 insertions, 1 deletions

diff --git a/src/lib/libcrypto/x509/x509_cmp.c b/src/lib/libcrypto/x509/x509_cmp.c
index 440467521b..001f98e61a 100644
--- a/src/lib/libcrypto/x509/x509_cmp.c
+++ b/src/lib/libcrypto/x509/x509_cmp.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: x509_cmp.c,v 1.28 2018/02/22 17:05:35 jsing Exp $ */
+/* $OpenBSD: x509_cmp.c,v 1.29 2018/02/22 17:22:02 jsing Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -370,3 +370,21 @@ X509_check_private_key(X509 *x, EVP_PKEY *k)
                 return 1;
         return 0;
 }
+
+/*
+ * Not strictly speaking an "up_ref" as a STACK doesn't have a reference
+ * count but it has the same effect by duping the STACK and upping the ref of
+ * each X509 structure.
+ */
+STACK_OF(X509) *
+X509_chain_up_ref(STACK_OF(X509) *chain)
+{
+        STACK_OF(X509) *ret;
+        size_t i;
+
+        ret = sk_X509_dup(chain);
+        for (i = 0; i < sk_X509_num(ret); i++)
+                X509_up_ref(sk_X509_value(ret, i));
+
+        return ret;
+}