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dm clone: Fix UAF in clone_dtr()
Dm_clone also has the same UAF problem when dm_resume()
and dm_destroy() are concurrent.
Therefore, cancelling timer again in clone_dtr().
Cc: stable@vger.kernel.org
Fixes: 7431b7835f
("dm: add clone target")
Signed-off-by: Luo Meng <luomeng12@huawei.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
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@ -1958,6 +1958,7 @@ static void clone_dtr(struct dm_target *ti)
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mempool_exit(&clone->hydration_pool);
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dm_kcopyd_client_destroy(clone->kcopyd_client);
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cancel_delayed_work_sync(&clone->waker);
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destroy_workqueue(clone->wq);
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hash_table_exit(clone);
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dm_clone_metadata_close(clone->cmd);
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