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nvme-rdma: fix possible use-after-free in transport error_recovery work

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[ Upstream commit b6bb1722f3 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Sagi Grimberg 2022-02-01 14:54:21 +02:00 • committed by Greg Kroah-Hartman
commit 324f5bdc52
1 changed files with 1 additions and 0 deletions
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drivers/nvme/host/rdma.c
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@ -1200,6 +1200,7 @@ static void nvme_rdma_error_recovery_work(struct work_struct *work)
struct nvme_rdma_ctrl, err_work);
nvme_stop_keep_alive(&ctrl->ctrl);
flush_work(&ctrl->ctrl.async_event_work);
nvme_rdma_teardown_io_queues(ctrl, false);
nvme_start_queues(&ctrl->ctrl);
nvme_rdma_teardown_admin_queue(ctrl, false);