| From 27660430c792c9c16a357cf987eca6ab9aaccef9 Mon Sep 17 00:00:00 2001 |
| From: Sunwook Eom <speed.eom@samsung.com> |
| Date: Fri, 10 Apr 2020 12:54:19 +0900 |
| Subject: [PATCH] dm verity fec: fix hash block number in verity_fec_decode |
| |
| 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: Paul Gortmaker <paul.gortmaker@windriver.com> |
| |
| diff --git a/drivers/md/dm-verity-fec.c b/drivers/md/dm-verity-fec.c |
| index 49147e634046..fb41b4f23c48 100644 |
| --- a/drivers/md/dm-verity-fec.c |
| +++ b/drivers/md/dm-verity-fec.c |
| @@ -435,7 +435,7 @@ int verity_fec_decode(struct dm_verity *v, struct dm_verity_io *io, |
| 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 |
| -- |
| 2.7.4 |
| |