FAILED: patch "[PATCH] dm verity: fix error handling for check_at_most_once on FEC" failed to apply to 5.4-stable tree

[<gregkh@linuxfoundation.org>]

The patch below does not apply to the 5.4-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>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.4.y
git checkout FETCH_HEAD
git cherry-pick -x e8c5d45f82ce0c238a4817739892fe8897a3dcc3
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2023050709-dry-stand-f81b@gregkh' --subject-prefix 'PATCH 5.4.y' HEAD^..

Possible dependencies:

e8c5d45f82ce ("dm verity: fix error handling for check_at_most_once on FEC")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From e8c5d45f82ce0c238a4817739892fe8897a3dcc3 Mon Sep 17 00:00:00 2001
From: Yeongjin Gil <youngjin.gil@samsung.com>
Date: Mon, 20 Mar 2023 15:59:32 +0900
Subject: [PATCH] dm verity: fix error handling for check_at_most_once on FEC

In verity_end_io(), if bi_status is not BLK_STS_OK, it can be return
directly. But if FEC configured, it is desired to correct the data page
through verity_verify_io. And the return value will be converted to
blk_status and passed to verity_finish_io().

BTW, when a bit is set in v->validated_blocks, verity_verify_io() skips
verification regardless of I/O error for the corresponding bio. In this
case, the I/O error could not be returned properly, and as a result,
there is a problem that abnormal data could be read for the
corresponding block.

To fix this problem, when an I/O error occurs, do not skip verification
even if the bit related is set in v->validated_blocks.

Fixes: 843f38d382b1 ("dm verity: add 'check_at_most_once' option to only validate hashes once")
Cc: stable@vger.kernel.org
Reviewed-by: Sungjong Seo <sj1557.seo@samsung.com>
Signed-off-by: Yeongjin Gil <youngjin.gil@samsung.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>

diff --git a/drivers/md/dm-verity-target.c b/drivers/md/dm-verity-target.c
index ade83ef3b439..9316399b920e 100644
--- a/drivers/md/dm-verity-target.c
+++ b/drivers/md/dm-verity-target.c
@@ -523,7 +523,7 @@ static int verity_verify_io(struct dm_verity_io *io)
 		sector_t cur_block = io->block + b;
 		struct ahash_request *req = verity_io_hash_req(v, io);
 
-		if (v->validated_blocks &&
+		if (v->validated_blocks && bio->bi_status == BLK_STS_OK &&
 		    likely(test_bit(cur_block, v->validated_blocks))) {
 			verity_bv_skip_block(v, io, iter);
 			continue;