Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 4.14 15/26] dm verity fec: fix hash block number in verity_fec_decode | Date | Mon, 4 May 2020 19:57:29 +0200 |
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From: Sunwook Eom <speed.eom@samsung.com>
commit ad4e80a639fc61d5ecebb03caa5cdbfb91fcebfc upstream.
The error correction data is computed as if data and hash blocks were concatenated. But hash block number starts from v->hash_start. So, we have to calculate hash block number based on that.
Fixes: a739ff3f543af ("dm verity: add support for forward error correction") Cc: stable@vger.kernel.org Signed-off-by: Sunwook Eom <speed.eom@samsung.com> Reviewed-by: Sami Tolvanen <samitolvanen@google.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/md/dm-verity-fec.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/md/dm-verity-fec.c +++ b/drivers/md/dm-verity-fec.c @@ -436,7 +436,7 @@ int verity_fec_decode(struct dm_verity * fio->level++; if (type == DM_VERITY_BLOCK_TYPE_METADATA) - block += v->data_blocks; + block = block - v->hash_start + v->data_blocks; /* * For RS(M, N), the continuous FEC data is divided into blocks of N
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