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    Subject[PATCH 4.9 10/18] dm verity fec: fix hash block number in verity_fec_decode
    Date
    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
    @@ -447,7 +447,7 @@ 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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