The patch below does not apply to the 4.19-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
Possible dependencies:
f50cb2cbabd6 ("dm integrity: Fix UAF in dm_integrity_dtr()")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From f50cb2cbabd6c4a60add93d72451728f86e4791c Mon Sep 17 00:00:00 2001
From: Luo Meng <luomeng12@xxxxxxxxxx>
Date: Tue, 29 Nov 2022 10:48:50 +0800
Subject: [PATCH] dm integrity: Fix UAF in dm_integrity_dtr()
Dm_integrity also has the same UAF problem when dm_resume()
and dm_destroy() are concurrent.
Therefore, cancelling timer again in dm_integrity_dtr().
Cc: stable@xxxxxxxxxxxxxxx
Fixes: 7eada909bfd7a ("dm: add integrity target")
Signed-off-by: Luo Meng <luomeng12@xxxxxxxxxx>
Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
diff --git a/drivers/md/dm-integrity.c b/drivers/md/dm-integrity.c
index e97e9f97456d..1388ee35571e 100644
--- a/drivers/md/dm-integrity.c
+++ b/drivers/md/dm-integrity.c
@@ -4558,6 +4558,8 @@ static void dm_integrity_dtr(struct dm_target *ti)
BUG_ON(!RB_EMPTY_ROOT(&ic->in_progress));
BUG_ON(!list_empty(&ic->wait_list));
+ if (ic->mode == 'B')
+ cancel_delayed_work_sync(&ic->bitmap_flush_work);
if (ic->metadata_wq)
destroy_workqueue(ic->metadata_wq);
if (ic->wait_wq)
