From 12dc759196d5e470445a62078cff2a6ca021ff77 Mon Sep 17 00:00:00 2001
From: Mark Reynolds <mreynolds@redhat.com>
Date: Apr 04 2014 17:53:32 +0000
Subject: Ticket 47766 - Tombstone purging can crash the server if the backend is stopped/disabled


Bug Description:  The tombstone purge thread issues a callback search that will start
                  reading id2entry, even if the backend is stopped.  This can crash the
                  server.

Fix Description:  When performing a search and returning entries, check if the backend
                  is started before reading id2entry.

https://fedorahosted.org/389/ticket/47766

Reviewed by: nhosoi(Thanks!)
(cherry picked from commit 559d70e0a1e3df75a66e41fd1c009b25ca6f6a08)

---

diff --git a/ldap/servers/slapd/back-ldbm/ldbm_search.c b/ldap/servers/slapd/back-ldbm/ldbm_search.c
index f70388f..00a1f51 100644
--- a/ldap/servers/slapd/back-ldbm/ldbm_search.c
+++ b/ldap/servers/slapd/back-ldbm/ldbm_search.c
@@ -1532,6 +1532,16 @@ ldbm_back_next_search_entry_ext( Slapi_PBlock *pb, int use_extension )
 
         ++sr->sr_lookthroughcount;    /* checked above */
 
+        /* Make sure the backend is available */
+        if( be->be_state != BE_STATE_STARTED ){
+            slapi_send_ldap_result( pb, LDAP_UNWILLING_TO_PERFORM, NULL,
+                                   "Backend is stopped", 0, NULL );
+            slapi_pblock_set( pb, SLAPI_SEARCH_RESULT_ENTRY, NULL );
+            delete_search_result_set(pb, &sr);
+            rc = SLAPI_FAIL_GENERAL;
+            goto bail;
+        }
+
         /* get the entry */
         e = id2entry( be, id, &txn, &err );
         if ( e == NULL )