UBI: fix check for "too many bytes"

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

Cc: stable <stable@vger.kernel.org>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
[rw: Fixed comparison]
Signed-off-by: Richard Weinberger <richard@nod.at>

diff --git a/drivers/mtd/ubi/cdev.c b/drivers/mtd/ubi/cdev.c
index d647e50..d16fccf 100644 (file)
--- a/drivers/mtd/ubi/cdev.c
+++ b/drivers/mtd/ubi/cdev.c
@@ -455,7 +455,7 @@ static long vol_cdev_ioctl(struct file *file, unsigned int cmd,
                /* 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;
 
                err = get_exclusive(desc);