UBI: add sanity check

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

diff --git a/drivers/mtd/ubi/scan.c b/drivers/mtd/ubi/scan.c
index 0c05f7b..e476638 100644 (file)
--- a/drivers/mtd/ubi/scan.c
+++ b/drivers/mtd/ubi/scan.c
@@ -286,9 +286,14 @@ static int compare_lebs(struct ubi_device *ubi, const struct ubi_scan_leb *seb,
                 * FIXME: but this is anyway obsolete and will be removed at
                 * some point.
                 */
-
                dbg_bld("using old crappy leb_ver stuff");
 
+               if (v1 == v2) {
+                       ubi_err("PEB %d and PEB %d have the same version %lld",
+                               seb->pnum, pnum, v1);
+                       return -EINVAL;
+               }
+
                abs = v1 - v2;
                if (abs < 0)
                        abs = -abs;