linux-kernel - [PATCH 3.2 016/164] UBI: fix check for "too many bytes"

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Message-ID: <lsq.1438473757.700029666@decadent.org.uk>
Date:	Sun, 02 Aug 2015 01:02:37 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Richard Weinberger" <richard@....at>,
	"Brian Norris" <computersforpeace@...il.com>
Subject: [PATCH 3.2 016/164] UBI: fix check for "too many bytes"

3.2.70-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Brian Norris <computersforpeace@...il.com>

commit 299d0c5b27346a77a0777c993372bf8777d4f2e5 upstream.

The comparison from the previous line seems to have been erroneously
(partially) copied-and-pasted onto the next. The second line should be
checking req.bytes, not req.lnum.

Coverity CID #139400

Signed-off-by: Brian Norris <computersforpeace@...il.com>
[rw: Fixed comparison]
Signed-off-by: Richard Weinberger <richard@....at>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/mtd/ubi/cdev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/mtd/ubi/cdev.c
+++ b/drivers/mtd/ubi/cdev.c
@@ -475,7 +475,7 @@ static long vol_cdev_ioctl(struct file *
 		/* Validate the request */
 		err = -EINVAL;
 		if (req.lnum < 0 || req.lnum >= vol->reserved_pebs ||
-		    req.bytes < 0 || req.lnum >= vol->usable_leb_size)
+		    req.bytes < 0 || req.bytes > vol->usable_leb_size)
 			break;
 		if (req.dtype != UBI_LONGTERM && req.dtype != UBI_SHORTTERM &&
 		    req.dtype != UBI_UNKNOWN)

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