dm verity fec: fix hash block number in verity_fec_decode
authorSunwook Eom <speed.eom@samsung.com>
Fri, 10 Apr 2020 03:54:19 +0000 (12:54 +0900)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 6 May 2020 06:15:10 +0000 (08:15 +0200)
commit969b9cb1209b2fd6fb3e1b6cda006e26dfeec51e
tree78e258734a898ca3ddbe88ea70ff91514d2195f3
parentc554ab856b668df35c69db6a54ad4e7660e362f2
dm verity fec: fix hash block number in verity_fec_decode

commit ad4e80a639fc61d5ecebb03caa5cdbfb91fcebfc upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/md/dm-verity-fec.c