mtd: mtdpart: prevent a read from regions[-1]

If the erase region was found in the first iteration we read from
regions[-1]

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c
index 349fcbe5cc0ff2718c7372bf3263b17a7af3c8d3..a83cfa1ad122b3a0d6ac3134ccfbbc27dd6ef865 100644 (file)
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -453,7 +453,8 @@ static struct mtd_part *add_one_partition(struct mtd_info *master,
                for (i = 0; i < max && regions[i].offset <= slave->offset; i++)
                        ;
                /* The loop searched for the region _behind_ the first one */
-               i--;
+               if (i > 0)
+                       i--;
 
                /* Pick biggest erasesize */
                for (; i < max && regions[i].offset < end; i++) {