This is a note to let you know that I've just added the patch titled
dm verity: fix error handling for check_at_most_once on FEC
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
dm-verity-fix-error-handling-for-check_at_most_once-.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 979171f8a48bdd2007e9640deef1b184a1f9bf63
Author: Yeongjin Gil <youngjin.gil@xxxxxxxxxxx>
Date: Mon Mar 20 15:59:32 2023 +0900
dm verity: fix error handling for check_at_most_once on FEC
[ Upstream commit e8c5d45f82ce0c238a4817739892fe8897a3dcc3 ]
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@xxxxxxxxxxxxxxx
Reviewed-by: Sungjong Seo <sj1557.seo@xxxxxxxxxxx>
Signed-off-by: Yeongjin Gil <youngjin.gil@xxxxxxxxxxx>
Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/md/dm-verity-target.c b/drivers/md/dm-verity-target.c
index aad0018cc7b2d..965b5139c8970 100644
--- a/drivers/md/dm-verity-target.c
+++ b/drivers/md/dm-verity-target.c
@@ -478,7 +478,7 @@ 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, &io->iter);
continue;
--
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