From e4b5957c6f749a501c464f92792f1c8e26b61a94 Mon Sep 17 00:00:00 2001
From: Luo Meng <luomeng12@huawei.com>
Date: Tue, 29 Nov 2022 10:48:48 +0800
Subject: [PATCH] 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: 7431b7835f554 ("dm: add clone target")
Signed-off-by: Luo Meng <luomeng12@huawei.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
---
drivers/md/dm-clone-target.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/md/dm-clone-target.c b/drivers/md/dm-clone-target.c
index 2f1cc66d26412..29e0b85eeaf09 100644
--- a/drivers/md/dm-clone-target.c
+++ b/drivers/md/dm-clone-target.c
@@ -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);
--
2.30.2