nvme-tcp: avoid request double completion for concurrent nvme_tcp_timeout

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[ Upstream commit 9ebbfe495e ]

Each name space has a request queue, if complete request long time,
multi request queues may have time out requests at the same time,
nvme_tcp_timeout will execute concurrently. Multi requests in different
request queues may be queued in the same tcp queue, multi
nvme_tcp_timeout may call nvme_tcp_stop_queue at the same time.
The first nvme_tcp_stop_queue will clear NVME_TCP_Q_LIVE and continue
stopping the tcp queue(cancel io_work), but the others check
NVME_TCP_Q_LIVE is already cleared, and then directly complete the
requests, complete request before the io work is completely canceled may
lead to a use-after-free condition.
Add a multex lock to serialize nvme_tcp_stop_queue.

Signed-off-by: Chao Leng <lengchao@huawei.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Chao Leng 2021-01-14 17:09:26 +08:00 • committed by Greg Kroah-Hartman

parent 3b87f9b062

commit 82ae0714c3

1 changed files with 10 additions and 4 deletions

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drivers/nvme/host/tcp.c

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