From: Heinz Mauelshagen <heinzm@redhat.com>
Date: Wed, 15 Jun 2016 20:27:08 +0000 (+0200)
Subject: dm raid: more restricting data_offset value checks
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=75dd3b9ecb027e90261ed4052e155e0c1236d717;p=linux-beck.git

dm raid: more restricting data_offset value checks

Signed-off-by: Heinz Mauelshagen <heinzm@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
---

diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c
index a38298589db8..b1dbf28f36d2 100644
--- a/drivers/md/dm-raid.c
+++ b/drivers/md/dm-raid.c
@@ -1221,7 +1221,8 @@ static int parse_raid_params(struct raid_set *rs, struct dm_arg_set *as,
 				return -EINVAL;
 			}
 			/* Ensure sensible data offset */
-			if (value < 0) {
+			if (value < 0 ||
+			    (value && (value < MIN_FREE_RESHAPE_SPACE || value % to_sector(PAGE_SIZE)))) {
 				rs->ti->error = "Bogus data_offset value";
 				return -EINVAL;
 			}