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dm verity fec: fix hash block number in verity_fec_decode
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>
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@ -435,7 +435,7 @@ int verity_fec_decode(struct dm_verity *v, struct dm_verity_io *io,
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fio->level++;
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if (type == DM_VERITY_BLOCK_TYPE_METADATA)
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block += v->data_blocks;
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block = block - v->hash_start + v->data_blocks;
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/*
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* For RS(M, N), the continuous FEC data is divided into blocks of N
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