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dm-verity: align struct dm_verity_fec_io properly

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commit 38bc1ab135db87577695816b190e7d6d8ec75879 upstream.

dm_verity_fec_io is placed after the end of two hash digests. If the hash
digest has unaligned length, struct dm_verity_fec_io could be unaligned.

This commit fixes the placement of struct dm_verity_fec_io, so that it's
aligned.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Cc: stable@vger.kernel.org
Fixes: a739ff3f543a ("dm verity: add support for forward error correction")
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mikulas Patocka 2023-11-28 14:50:23 +01:00 committed by Ksawlii
parent f072600b9d
commit e0d7b1c3db
2 changed files with 2 additions and 7 deletions
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3
drivers/md/dm-verity-fec.c
View file

@ -24,7 +24,8 @@ bool verity_fec_is_enabled(struct dm_verity *v)
*/
static inline struct dm_verity_fec_io *fec_io(struct dm_verity_io *io)
{
return (struct dm_verity_fec_io *) verity_io_digest_end(io->v, io);
return (struct dm_verity_fec_io *)
((char *)io + io->v->ti->per_io_data_size - sizeof(struct dm_verity_fec_io));
}
/*

6
drivers/md/dm-verity.h
View file

@ -111,12 +111,6 @@ static inline u8 *verity_io_want_digest(struct dm_verity *v,
return (u8 *)(io + 1) + v->ahash_reqsize + v->digest_size;
}
static inline u8 *verity_io_digest_end(struct dm_verity *v,
struct dm_verity_io *io)
{
return verity_io_want_digest(v, io) + v->digest_size;
}
extern int verity_for_bv_block(struct dm_verity *v, struct dm_verity_io *io,
struct bvec_iter *iter,
int (*process)(struct dm_verity *v,