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dm verity fec: fix hash block number in verity_fec_decode

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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>
This commit is contained in:
Sunwook Eom 2020-04-10 12:54:19 +09:00 committed by Greg Kroah-Hartman
parent 3ad04be60c
commit 74381a0cf2
1 changed files with 1 additions and 1 deletions
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2
drivers/md/dm-verity-fec.c
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@ -436,7 +436,7 @@ 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