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

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
...@@ -453,9 +453,7 @@ int verity_fec_decode(struct dm_verity *v, struct dm_verity_io *io, ...@@ -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
......
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