Commit ad4e80a6 authored Apr 10, 2020 by Sunwook Eom Committed by Mike Snitzer Apr 16, 2020

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: a739ff3f ("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>

parent 31b22120

drivers/md/dm-verity-fec.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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

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