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 a382985..b1dbf28 100644 (file)
--- 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;
                        }