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Commit 602d1657 authored by Sami Tolvanen's avatar Sami Tolvanen Committed by Mike Snitzer
Browse files

dm verity fec: fix block calculation 



do_div was replaced with div64_u64 at some point, causing a bug with
block calculation due to incompatible semantics of the two functions.

Signed-off-by: default avatarSami Tolvanen <samitolvanen@google.com>
Fixes: a739ff3f ("dm verity: add support for forward error correction")
Cc: stable@vger.kernel.org # v4.5+
Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
parent 028b39e3

drivers/md/dm-verity-fec.c

+1 −3
Original line number Original line Diff line number Diff line
@@ -453,9 +453,7 @@ int verity_fec_decode(struct dm_verity *v, struct dm_verity_io *io, 
	 */

	 */





	offset = block << v->data_dev_block_bits;

	offset = block << v->data_dev_block_bits;



	res = div64_u64(offset, v->fec->rounds << v->data_dev_block_bits);

	res = offset;

	div64_u64(res, v->fec->rounds << v->data_dev_block_bits);





	/*

	/*

	 * The base RS block we can feed to the interleaver to find out all

	 * The base RS block we can feed to the interleaver to find out all