nvme-rdma: fix double freeing of async event data

Some error paths in configuration of admin queue free data buffer
associated with async request SQE without resetting the data buffer
pointer to NULL, This buffer is also freed up again if the controller
is shutdown or reset.

Signed-off-by: Prabhath Sajeepa <psajeepa@purestorage.com>
Reviewed-by: Roland Dreier <roland@purestorage.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c
index d181cafedc584916d0b04db2e08dd9e0802cba0c..ab6ec7295bf900e54d82c624e4f45f30c342d5df 100644 (file)
--- a/drivers/nvme/host/rdma.c
+++ b/drivers/nvme/host/rdma.c
@@ -184,6 +184,7 @@ static int nvme_rdma_alloc_qe(struct ib_device *ibdev, struct nvme_rdma_qe *qe,
        qe->dma = ib_dma_map_single(ibdev, qe->data, capsule_size, dir);
        if (ib_dma_mapping_error(ibdev, qe->dma)) {
                kfree(qe->data);
+               qe->data = NULL;
                return -ENOMEM;
        }
 
@@ -823,6 +824,7 @@ out_free_tagset:
 out_free_async_qe:
        nvme_rdma_free_qe(ctrl->device->dev, &ctrl->async_event_sqe,
                sizeof(struct nvme_command), DMA_TO_DEVICE);
+       ctrl->async_event_sqe.data = NULL;
 out_free_queue:
        nvme_rdma_free_queue(&ctrl->queues[0]);
        return error;