From c2cac4588a40480c020d320b544bc5f8e72adb11 Mon Sep 17 00:00:00 2001
From: Howard Chu <hyc@symas.com>
Date: Tue, 11 Jun 2013 17:13:08 -0700
Subject: [PATCH] Fix CURSOR_NEXT/PREV on emptied DB

---
 libraries/liblmdb/mdb.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/libraries/liblmdb/mdb.c b/libraries/liblmdb/mdb.c
index a90d7d5..f52dda7 100644
--- a/libraries/liblmdb/mdb.c
+++ b/libraries/liblmdb/mdb.c
@@ -4935,9 +4935,11 @@ fetchm:
 	case MDB_NEXT:
 	case MDB_NEXT_DUP:
 	case MDB_NEXT_NODUP:
-		if (!(mc->mc_flags & C_INITIALIZED))
+		if (!(mc->mc_flags & C_INITIALIZED)) {
 			rc = mdb_cursor_first(mc, key, data);
-		else
+			if (rc)
+				break;
+		} else
 			rc = mdb_cursor_next(mc, key, data, op);
 		break;
 	case MDB_PREV:
@@ -4945,6 +4947,8 @@ fetchm:
 	case MDB_PREV_NODUP:
 		if (!(mc->mc_flags & C_INITIALIZED)) {
 			rc = mdb_cursor_last(mc, key, data);
+			if (rc)
+				break;
 			mc->mc_flags |= C_INITIALIZED;
 			mc->mc_ki[mc->mc_top]++;
 		}