From 6a459d8edbdbe7b24db42a5a9f21e6aa9e00c2aa Mon Sep 17 00:00:00 2001
From: Luo Meng <luomeng12@huawei.com>
Date: Tue, 29 Nov 2022 10:48:49 +0800
Subject: [PATCH] dm cache: Fix UAF in destroy()
Git-commit: 6a459d8edbdbe7b24db42a5a9f21e6aa9e00c2aa
Patch-mainline: v6.2-rc1
References: git-fixes

Dm_cache also has the same UAF problem when dm_resume()
and dm_destroy() are concurrent.

Therefore, cancelling timer again in destroy().

Cc: stable@vger.kernel.org
Fixes: c6b4fcbad044e ("dm: add cache target")
Signed-off-by: Luo Meng <luomeng12@huawei.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Signed-off-by: Coly Li <colyli@suse.de>

---
 drivers/md/dm-cache-target.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c
index 54a8d5c9a44e..624a6335c832 100644
--- a/drivers/md/dm-cache-target.c
+++ b/drivers/md/dm-cache-target.c
@@ -1887,6 +1887,7 @@ static void destroy(struct cache *cache)
 	if (cache->prison)
 		dm_bio_prison_destroy_v2(cache->prison);
 
+	cancel_delayed_work_sync(&cache->waker);
 	if (cache->wq)
 		destroy_workqueue(cache->wq);
 
-- 
2.35.3