nvme-rdma: stop admin queue before freeing it

For any failure after nvme_rdma_start_queue in
nvme_rdma_configure_admin_queue, the admin queue will be freed with the
NVME_RDMA_Q_LIVE flag still set.  Once nvme_rdma_stop_queue is invoked,
that will cause a use-after-free.
BUG: KASAN: use-after-free in rdma_disconnect+0x1f/0xe0 [rdma_cm]

To fix it, call nvme_rdma_stop_queue for all the failed cases after
nvme_rdma_start_queue.
Signed-off-by: NJianchao Wang <jianchao.w.wang@oracle.com>
Suggested-by: NSagi Grimberg <sagi@grimberg.me>
Reviewed-by: NMax Gurtovoy <maxg@mellanox.com>
Signed-off-by: NChristoph Hellwig <hch@lst.de>

drivers/nvme/host/rdma.c

@@ -778,7 +778,7 @@ static int nvme_rdma_configure_admin_queue(struct nvme_rdma_ctrl *ctrl,
 	if (error) {
 		dev_err(ctrl->ctrl.device,
 			"prop_get NVME_REG_CAP failed\n");
-		goto out_cleanup_queue;
+		goto out_stop_queue;
 	}
 
 	ctrl->ctrl.sqsize =
@@ -786,23 +786,25 @@ static int nvme_rdma_configure_admin_queue(struct nvme_rdma_ctrl *ctrl,
 
 	error = nvme_enable_ctrl(&ctrl->ctrl, ctrl->ctrl.cap);
 	if (error)
-		goto out_cleanup_queue;
+		goto out_stop_queue;
 
 	ctrl->ctrl.max_hw_sectors =
 		(ctrl->max_fr_pages - 1) << (ilog2(SZ_4K) - 9);
 
 	error = nvme_init_identify(&ctrl->ctrl);
 	if (error)
-		goto out_cleanup_queue;
+		goto out_stop_queue;
 
 	error = nvme_rdma_alloc_qe(ctrl->queues[0].device->dev,
 			&ctrl->async_event_sqe, sizeof(struct nvme_command),
 			DMA_TO_DEVICE);
 	if (error)
-		goto out_cleanup_queue;
+		goto out_stop_queue;
 
 	return 0;
 
+out_stop_queue:
+	nvme_rdma_stop_queue(&ctrl->queues[0]);
 out_cleanup_queue:
 	if (new)
 		blk_cleanup_queue(ctrl->ctrl.admin_q);