Patch "dm verity fec: fix block calculation" has been added to the 4.7-stable tree

Patch "dm verity fec: fix block calculation" has been added to the 4.7-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    dm verity fec: fix block calculation

to the 4.7-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     dm-verity-fec-fix-block-calculation.patch
and it can be found in the queue-4.7 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 602d1657c603eedd7379a8bcde1ad3a2972ecc5f Mon Sep 17 00:00:00 2001
From: Sami Tolvanen <samitolvanen@google.com>
Date: Tue, 21 Jun 2016 11:02:42 -0700
Subject: dm verity fec: fix block calculation

From: Sami Tolvanen <samitolvanen@google.com>

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@google.com>
Fixes: a739ff3f543a ("dm verity: add support for forward error correction")
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 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


Patches currently in stable-queue which might be from samitolvanen@google.com are

queue-4.7/dm-verity-fec-fix-block-calculation.patch