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dm clone: Fix UAF in clone_dtr()

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commit e4b5957c6f upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Luo Meng 2022-11-29 10:48:48 +08:00 committed by Greg Kroah-Hartman
parent b6c93cd61a
commit 9e113cd4f6
1 changed files with 1 additions and 0 deletions
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1
drivers/md/dm-clone-target.c
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@ -1958,6 +1958,7 @@ static void clone_dtr(struct dm_target *ti)
mempool_exit(&clone->hydration_pool);
dm_kcopyd_client_destroy(clone->kcopyd_client);
cancel_delayed_work_sync(&clone->waker);
destroy_workqueue(clone->wq);
hash_table_exit(clone);
dm_clone_metadata_close(clone->cmd);