4.7-stable review patch. If anyone has any objections, please let me know.
------------------
From: Sami Tolvanen <samitolvanen@xxxxxxxxxx>
commit 602d1657c603eedd7379a8bcde1ad3a2972ecc5f upstream.
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: Sami Tolvanen <samitolvanen@xxxxxxxxxx>
Fixes: a739ff3f543a ("dm verity: add support for forward error correction")
Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/md/dm-verity-fec.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
--- a/drivers/md/dm-verity-fec.c
+++ b/drivers/md/dm-verity-fec.c
@@ -453,9 +453,7 @@ int verity_fec_decode(struct dm_verity *
*/
offset = block << v->data_dev_block_bits;
-
- res = offset;
- div64_u64(res, v->fec->rounds << v->data_dev_block_bits);
+ res = div64_u64(offset, v->fec->rounds << v->data_dev_block_bits);
/*
* The base RS block we can feed to the interleaver to find out all
--
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