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@vger.kernel.org.

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@huawei.com 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@vger.kernel.org Fixes: 7eada909bfd7a ("dm: add integrity target") Signed-off-by: Luo Meng luomeng12@huawei.com Signed-off-by: Mike Snitzer snitzer@kernel.org

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)