The error correction data is computed as if data and hash blocks
were concatenated. But hash block number is start 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")
Signed-off-by: Sunwook Eom <speed.eom@xxxxxxxxxxx>
---
drivers/md/dm-verity-fec.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
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
--
2.17.1
--
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