From: Roel Kluin <roel.kluin@gmail.com>
Date: Fri, 18 Sep 2009 19:51:50 +0000 (-0700)
Subject: mtd: mtdpart: prevent a read from regions[-1]
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=a57ca0466af5da83e379d636b8c01fd53b41e2c6;p=deliverable%2Flinux.git

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 349fcbe5cc0f..a83cfa1ad122 100644
--- 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++) {