From bbb07f88471e595405f2cdae5e138b324550d55d Mon Sep 17 00:00:00 2001
From: Howard Chu <hyc@symas.com>
Date: Sat, 9 Sep 2017 15:10:23 +0100
Subject: [PATCH] ITS#8728 fix MDB_VL32 freeing overflow page

Fix #2420
---
 external/db_drivers/liblmdb/mdb.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/external/db_drivers/liblmdb/mdb.c b/external/db_drivers/liblmdb/mdb.c
index 377512eb..b3de9702 100644
--- a/external/db_drivers/liblmdb/mdb.c
+++ b/external/db_drivers/liblmdb/mdb.c
@@ -6288,6 +6288,10 @@ release:
 		if (rc)
 			return rc;
 	}
+#ifdef MDB_VL32
+	if (mc->mc_ovpg == mp)
+		mc->mc_ovpg = NULL;
+#endif
 	mc->mc_db->md_overflow_pages -= ovpages;
 	return 0;
 }