nvme-rdma: fix possible use-after-free in transport error_recovery work
While nvme_rdma_submit_async_event_work is checking the ctrl and queue state before preparing the AER command and scheduling io_work, in order to fully prevent a race where this check is not reliable the error recovery work must flush async_event_work before continuing to destroy the admin queue after setting the ctrl state to RESETTING such that there is no race .submit_async_event and the error recovery handler itself changing the ctrl state. Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
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@ -1200,6 +1200,7 @@ static void nvme_rdma_error_recovery_work(struct work_struct *work)
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struct nvme_rdma_ctrl, err_work);
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nvme_stop_keep_alive(&ctrl->ctrl);
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flush_work(&ctrl->ctrl.async_event_work);
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nvme_rdma_teardown_io_queues(ctrl, false);
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nvme_start_queues(&ctrl->ctrl);
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nvme_rdma_teardown_admin_queue(ctrl, false);
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