[bug report] Crash in rdma_disconnect()

["Boyer, Andrew" <Andrew.Boyer@xxxxxxxx>]

If the client accidentally calls rdma_disconnect() before the connection is complete, it will crash in ucma_shutdown(). Should this be hardened to return an error rather than crashing?

Thanks,
Andrew

#9  0x00007f2f0c9da81e in ucma_shutdown (id=id@entry=0x269c2010) at /usr/src/debug/rdma-core-16/librdmacm/cma.c:1687
1687		switch (id->verbs->device->transport_type) {
(gdb) p id
$2 = (struct rdma_cm_id *) 0x269c2010
(gdb) p id->verbs
$3 = (struct ibv_context *) 0x0

int ucma_shutdown(struct rdma_cm_id *id)
{
        switch (id->verbs->device->transport_type) {
        case IBV_TRANSPORT_IB:
                return ucma_modify_qp_err(id);
        case IBV_TRANSPORT_IWARP:
                return ucma_modify_qp_sqd(id);
        default:
                return ERR(EINVAL);
	}
}

int rdma_disconnect(struct rdma_cm_id *id)
{
        struct ucma_abi_disconnect cmd;
        struct cma_id_private *id_priv;
        int ret;

        ret = ucma_shutdown(id);
        if (ret)
                return ret;




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