Messages in this thread Patch in this message | | | From | Sasha Levin <> | Subject | [PATCH AUTOSEL 5.10 21/27] nvme-tcp: fix possible use-after-free in transport error_recovery work | Date | Wed, 9 Feb 2022 13:40:57 -0500 |
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From: Sagi Grimberg <sagi@grimberg.me>
[ Upstream commit ff9fc7ebf5c06de1ef72a69f9b1ab40af8b07f9e ]
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> Signed-off-by: Sasha Levin <sashal@kernel.org> --- drivers/nvme/host/tcp.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c index e99d439894187..45b3a919ac281 100644 --- a/drivers/nvme/host/tcp.c +++ b/drivers/nvme/host/tcp.c @@ -2069,6 +2069,7 @@ 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); -- 2.34.1
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