diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
index d422e8fd7137..225aa8279960 100644
--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c
@@ -3104,7 +3104,8 @@ iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size,
 	conn = cls_conn->dd_data;
 	memset(conn, 0, sizeof(*conn) + dd_size);
 
-	conn->dd_data = cls_conn->dd_data + sizeof(*conn);
+	if (dd_size)
+		conn->dd_data = cls_conn->dd_data + sizeof(*conn);
 	conn->session = session;
 	conn->cls_conn = cls_conn;
 	conn->c_stage = ISCSI_CONN_INITIAL_STAGE;