Fix CVE-2017-9287:

https://www.openldap.org/its/?findid=8655
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-9287

Patch copied from upstream source repository:

https://www.openldap.org/devel/gitweb.cgi?p=openldap.git;a=commit;h=0cee1ffb6021b1aae3fcc9581699da1c85a6dd6e

From 0cee1ffb6021b1aae3fcc9581699da1c85a6dd6e Mon Sep 17 00:00:00 2001
From: Ryan Tandy <ryan@nardis.ca>
Date: Wed, 17 May 2017 20:07:39 -0700
Subject: [PATCH] ITS#8655 fix double free on paged search with pagesize 0

Fixes a double free when a search includes the Paged Results control
with a page size of 0 and the search base matches the filter.
---
 servers/slapd/back-mdb/search.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/servers/slapd/back-mdb/search.c b/servers/slapd/back-mdb/search.c
index 301d1a498c..43442aa242 100644
--- a/servers/slapd/back-mdb/search.c
+++ b/servers/slapd/back-mdb/search.c
@@ -1066,7 +1066,8 @@ notfound:
 			/* check size limit */
 			if ( get_pagedresults(op) > SLAP_CONTROL_IGNORED ) {
 				if ( rs->sr_nentries >= ((PagedResultsState *)op->o_pagedresults_state)->ps_size ) {
-					mdb_entry_return( op, e );
+					if (e != base)
+						mdb_entry_return( op, e );
 					e = NULL;
 					send_paged_response( op, rs, &lastid, tentries );
 					goto done;
-- 
2.13.0

