From 797ff136a8852d8301a946a2f29b2c34caa084d0 Mon Sep 17 00:00:00 2001
From: Howard Chu <hyc@symas.com>
Date: Wed, 5 Mar 2014 20:40:12 -0800
Subject: [PATCH] ITS#7815 more for page_split

This case didn't come up in testing. Needs finer grained test.
---
 libraries/liblmdb/mdb.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/libraries/liblmdb/mdb.c b/libraries/liblmdb/mdb.c
index 4f0081c..fd0a3b5 100644
--- a/libraries/liblmdb/mdb.c
+++ b/libraries/liblmdb/mdb.c
@@ -7765,7 +7765,13 @@ mdb_page_split(MDB_cursor *mc, MDB_val *newkey, MDB_val *newdata, pgno_t newpgno
 				mc->mc_ki[i] = mn.mc_ki[i];
 			}
 			mc->mc_pg[ptop] = mn.mc_pg[ptop];
-			mc->mc_ki[ptop] = mn.mc_ki[ptop] - 1;
+			if (mn.mc_ki[ptop]) {
+				mc->mc_ki[ptop] = mn.mc_ki[ptop] - 1;
+			} else {
+				/* find right page's left sibling */
+				mc->mc_ki[ptop] = mn.mc_ki[ptop];
+				mdb_cursor_sibling(mc, 0);
+			}
 		}
 	} else {
 		mn.mc_top--;