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

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While nvme_tcp_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.

Tested-by: Chris Leech <cleech@redhat.com>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
This commit is contained in:
Sagi Grimberg 2022-02-01 14:54:20 +02:00 committed by Christoph Hellwig
parent 0fa0f99fc8
commit ff9fc7ebf5
1 changed files with 1 additions and 0 deletions
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1
drivers/nvme/host/tcp.c
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@ -2096,6 +2096,7 @@ static void nvme_tcp_error_recovery_work(struct work_struct *work)
struct nvme_ctrl *ctrl = &tcp_ctrl->ctrl;
nvme_stop_keep_alive(ctrl);
flush_work(&ctrl->async_event_work);
nvme_tcp_teardown_io_queues(ctrl, false);
/* unquiesce to fail fast pending requests */
nvme_start_queues(ctrl);