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>

diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c
index 438d694..3d25add 100644 (file)
--- a/drivers/nvme/host/rdma.c
+++ b/drivers/nvme/host/rdma.c
@@ -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;
 }