Commit c8dbc37c authored Nov 08, 2016 by Steve Wise Committed by Sagi Grimberg Nov 14, 2016

nvme-rdma: stop and free io queues on connect failure



While testing nvme-rdma with the spdk nvmf target over iw_cxgb4, I
configured the target (mistakenly) to generate an error creating the
NVMF IO queues.  This resulted a "Invalid SQE Parameter" error sent back
to the host on the first IO queue connect:

[ 9610.928182] nvme nvme1: queue_size 128 > ctrl maxcmd 120, clamping down
[ 9610.938745] nvme nvme1: creating 32 I/O queues.

So nvmf_connect_io_queue() returns an error to
nvmf_connect_io_queue() / nvmf_connect_io_queues(), and that
is returned to nvme_rdma_create_io_queues().  In the error path,
nvmf_rdma_create_io_queues() frees the queue tagset memory _before_
stopping and freeing the IB queues, which causes yet another
touch-after-free crash due to SQ CQEs being flushed after the ib_cqe
structs pointed-to by the flushed WRs have been freed (since they are
part of the nvme_rdma_request struct).

The fix is to stop and free the queues in nvmf_connect_io_queues()
if there is an error connecting any of the queues.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>

parent 766dbb17

drivers/nvme/host/rdma.c

+9 −2

Original line number	Diff line number	Diff line
		@@ -625,11 +625,18 @@ static int nvme_rdma_connect_io_queues(struct nvme_rdma_ctrl *ctrl)

		for (i = 1; i < ctrl->queue_count; i++) {
		ret = nvmf_connect_io_queue(&ctrl->ctrl, i);
		if (ret)
		break;
		if (ret) {
		dev_info(ctrl->ctrl.device,
		"failed to connect i/o queue: %d\n", ret);
		goto out_free_queues;
		}
		set_bit(NVME_RDMA_Q_LIVE, &ctrl->queues[i].flags);
		}

		return 0;

		out_free_queues:
		nvme_rdma_free_io_queues(ctrl);
		return ret;
		}