check pointers (ITS#4320)

diff --git a/servers/slapd/controls.c b/servers/slapd/controls.c
index 280b4f14b0db6b47a1720cf9fc56539c807c42b7..0ed668bd8030354264ba345f2efb32c0ad8be5f5 100644 (file)
--- a/servers/slapd/controls.c
+++ b/servers/slapd/controls.c
@@ -893,10 +893,16 @@ static int parseProxyAuthz (
                        op->o_connid, 0, 0 );
 
                /* anonymous */
-               op->o_ndn.bv_val[ 0 ] = '\0';
+               /* FIXME: do we let anonymous authz as anonymous?
+                * should we disallow authz at all for anonymous? */
+               if ( !BER_BVISNULL( &op->o_ndn ) ) {
+                       op->o_ndn.bv_val[ 0 ] = '\0';
+               }
                op->o_ndn.bv_len = 0;
 
-               op->o_dn.bv_val[ 0 ] = '\0';
+               if ( !BER_BVISNULL( &op->o_dn ) ) {
+                       op->o_dn.bv_val[ 0 ] = '\0';
+               }
                op->o_dn.bv_len = 0;
 
                return LDAP_SUCCESS;