From 53f624bff0d7d08b64b48ab0c6683f4145b9bcac Mon Sep 17 00:00:00 2001
From: Howard Chu <hyc@openldap.org>
Date: Mon, 28 Dec 2015 20:31:09 +0000
Subject: [PATCH] MDB_VL32 fix cursor_unref - ignore cursor with empty stack

---
 libraries/liblmdb/mdb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libraries/liblmdb/mdb.c b/libraries/liblmdb/mdb.c
index 19930fc..ae32c98 100644
--- a/libraries/liblmdb/mdb.c
+++ b/libraries/liblmdb/mdb.c
@@ -1952,7 +1952,7 @@ static void
 mdb_cursor_unref(MDB_cursor *mc)
 {
 	int i;
-	if (!mc->mc_pg[0] || IS_SUBP(mc->mc_pg[0]))
+	if (!mc->mc_snum || !mc->mc_pg[0] || IS_SUBP(mc->mc_pg[0]))
 		return;
 	for (i=0; i<mc->mc_snum; i++)
 		mdb_page_unref(mc->mc_txn, mc->mc_pg[i]);