UBI: add sanity check

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

1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/mtd/ubi/scan.c b/drivers/mtd/ubi/scan.c
index 0c05f7b90127..e47663870501 100644
--- 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;