1 files changed, 15 insertions, 1 deletions

diff --git a/src/lib/libssl/bs_cbb.c b/src/lib/libssl/bs_cbb.c
index 9de75fbb02..bf7de3fd33 100644
--- a/src/lib/libssl/bs_cbb.c
+++ b/src/lib/libssl/bs_cbb.c
@@ -1,4 +1,4 @@
-/*      $OpenBSD: bs_cbb.c,v 1.17 2017/08/12 02:50:05 jsing Exp $       */
+/*      $OpenBSD: bs_cbb.c,v 1.18 2017/11/28 16:34:20 jsing Exp $       */
 /*
  * Copyright (c) 2014, Google Inc.
  *
@@ -271,6 +271,20 @@ CBB_flush(CBB *cbb)
         return 1;
 }
 
+void
+CBB_discard_child(CBB *cbb)
+{
+        if (cbb->child == NULL)
+                return;
+
+        cbb->base->len = cbb->offset;
+        
+        cbb->child->base = NULL;
+        cbb->child = NULL;
+        cbb->pending_len_len = 0;
+        cbb->pending_is_asn1 = 0;
+        cbb->offset = 0;
+}
 
 static int
 cbb_add_length_prefixed(CBB *cbb, CBB *out_contents, size_t len_len)