ITS#8199 fix NULL ptr dereference in at_next

Deleting all values of olcAttributeTypes and then adding a value with
index > 0 triggers a NULL dereference when config_generic tries to
append to a list that doesn't exist yet.

Already fixed for olcObjectClasses in ITS#5388.

diff --git a/servers/slapd/at.c b/servers/slapd/at.c
index c4d65cfd615a60d2c26db2ec87cc8cbf1e00cfc0..d361d91df50823bf4d3497f784bc7e794871683f 100644 (file)
--- a/servers/slapd/at.c
+++ b/servers/slapd/at.c
@@ -365,6 +365,10 @@ at_next( AttributeType **at )
        }
 #endif
 
+       if ( *at == NULL ) {
+               return 0;
+       }
+
        *at = LDAP_STAILQ_NEXT(*at,sat_next);
 
        return (*at != NULL);