Before 2.7.50 clients will send a struct obd_connect_data_v1 rather than a
full struct obd_connect_data. So care must be taken when accessing fields
that are not present in struct obd_connect_data_v1. For example in mdt_connect_internal() when we clear ocd_connect_flags2 we may be writing past the end of the request field buffer:

        data->ocd_connect_flags &= MDT_CONNECT_SUPPORTED;
        data->ocd_connect_flags2 &= MDT_CONNECT_SUPPORTED2;