From 2bccc85ff82fb70fa7df2fdeb7a763c8333ef1f1 Mon Sep 17 00:00:00 2001
From: Howard Chu <hyc@openldap.org>
Date: Fri, 4 May 2018 17:15:43 +0300
Subject: [PATCH] mdbx: backport - can't use fakepage mp_ptrs directly
 (ITS#8819).

---
 mdb.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mdb.c b/mdb.c
index 082e823e..43f95cb0 100644
--- a/mdb.c
+++ b/mdb.c
@@ -7081,8 +7081,9 @@ prep_subDB:
 				} else {
 					memcpy((char *)mp + mp->mp_upper + PAGEBASE, (char *)fp + fp->mp_upper + PAGEBASE,
 						olddata.mv_size - fp->mp_upper - PAGEBASE);
+					memcpy((char *)(&mp->mp_ptrs), (char *)(&fp->mp_ptrs), NUMKEYS(fp) * sizeof(mp->mp_ptrs[0]));
 					for (i=0; i<NUMKEYS(fp); i++)
-						mp->mp_ptrs[i] = fp->mp_ptrs[i] + offset;
+						mp->mp_ptrs[i] += offset;
 				}
 			}