From d2958a2a4e6f0143b98b85532be3b9c9dd27cded Mon Sep 17 00:00:00 2001
From: Howard Chu <hyc@openldap.org>
Date: Thu, 2 Feb 2012 02:53:40 -0800
Subject: [PATCH] ITS#7144 fix crash replicating modDN if oldRDN not present

---
 servers/slapd/syncrepl.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/servers/slapd/syncrepl.c b/servers/slapd/syncrepl.c
index 6acdaf2077..48b315ebb8 100644
--- a/servers/slapd/syncrepl.c
+++ b/servers/slapd/syncrepl.c
@@ -4135,7 +4135,10 @@ dn_callback(
 					dni->oldDesc = ad;
 					for ( oldpos=0, a=rs->sr_entry->e_attrs;
 						a && a->a_desc != ad; oldpos++, a=a->a_next );
-					dni->oldNcount = a->a_numvals;
+					/* a should not be NULL but apparently it happens.
+					 * ITS#7144
+					 */
+					dni->oldNcount = a ? a->a_numvals : 0;
 					for ( newpos=0, a=dni->new_entry->e_attrs;
 						a && a->a_desc != ad; newpos++, a=a->a_next );
 					if ( !a || oldpos != newpos || attr_valfind( a,
-- 
2.39.5