commit 75dd3b9ecb027e90261ed4052e155e0c1236d717
author Heinz Mauelshagen <heinzm@redhat.com> Wed Jun 15 22:27:08 2016 +0200
committer Mike Snitzer <snitzer@redhat.com> Mon Jul 18 15:37:19 2016 -0400
tree a62e1f12e02dcb80cfd0b6fd69dfd1556350de11
parent 5fa146b25ba86682f74e3060debd4c4d3073561b

dm raid: more restricting data_offset value checks

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

drivers/md/dm-raid.c

diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c
index a382985..b1dbf28 100644
--- a/drivers/md/dm-raid.c
+++ b/drivers/md/dm-raid.c
@@ -1221,7 +1221,8 @@
 				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;
 			}