ITS#5332 someone else may free the entry as soon as we unlock it

servers/slapd/back-bdb/cache.c

@@ -251,15 +251,17 @@ bdb_cache_return_entry_rw( struct bdb_info *bdb, Entry *e,
 	EntryInfo *ei;
 	int free = 0;
 
-	bdb_cache_entry_db_unlock( bdb, lock );
 	ei = e->e_private;
-	bdb_cache_entryinfo_lock( ei );
-	if ( ei->bei_state & CACHE_ENTRY_NOT_CACHED ) {
-		ei->bei_e = NULL;
-		ei->bei_state ^= CACHE_ENTRY_NOT_CACHED;
-		free = 1;
+	bdb_cache_entry_db_unlock( bdb, lock );
+	if ( ei ) {
+		bdb_cache_entryinfo_lock( ei );
+		if ( ei->bei_state & CACHE_ENTRY_NOT_CACHED ) {
+			ei->bei_e = NULL;
+			ei->bei_state ^= CACHE_ENTRY_NOT_CACHED;
+			free = 1;
+		}
+		bdb_cache_entryinfo_unlock( ei );
 	}
-	bdb_cache_entryinfo_unlock( ei );
 	if ( free ) {
 		e->e_private = NULL;
 		bdb_entry_return( e );