4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jianchao Wang <jianchao.w.w...@oracle.com>

[ Upstream commit 2e050f00a0f0e07467050cb4afae0234941e5bf3 ]

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: Jianchao Wang <jianchao.w.w...@oracle.com>
Suggested-by: Sagi Grimberg <s...@grimberg.me>
Reviewed-by: Max Gurtovoy <m...@mellanox.com>
Signed-off-by: Christoph Hellwig <h...@lst.de>
Signed-off-by: Sasha Levin <alexander.le...@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 drivers/nvme/host/rdma.c |   10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

--- a/drivers/nvme/host/rdma.c
+++ b/drivers/nvme/host/rdma.c
@@ -796,7 +796,7 @@ static int nvme_rdma_configure_admin_que
        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 =
@@ -804,23 +804,25 @@ static int nvme_rdma_configure_admin_que
 
        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);


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