[3.19.y-ckt stable] Patch "[media] cx24117: fix a buffer overflow when checking userspace params" has been added to staging queue

[Kamal Mostafa]

This is a note to let you know that I have just added a patch titled

    [media] cx24117: fix a buffer overflow when checking userspace params

to the linux-3.19.y-queue branch of the 3.19.y-ckt extended stable tree 
which can be found at:

    http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-3.19.y-queue

This patch is scheduled to be released in version 3.19.y-ckt4.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.19.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

------

>From 991b83c5c8959cce15688f97afdd7e2b1a624ff8 Mon Sep 17 00:00:00 2001
From: Mauro Carvalho Chehab <mchehab at osg.samsung.com>
Date: Tue, 28 Apr 2015 19:03:59 -0300
Subject: [media] cx24117: fix a buffer overflow when checking userspace params

commit 82e3b88b679049f043fe9b03991d6d66fc0a43c8 upstream.

The maximum size for a DiSEqC command is 6, according to the
userspace API. However, the code allows to write up much more values:
	drivers/media/dvb-frontends/cx24116.c:983 cx24116_send_diseqc_msg() error: buffer overflow 'd->msg' 6 <= 23

Signed-off-by: Mauro Carvalho Chehab <mchehab at osg.samsung.com>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 drivers/media/dvb-frontends/cx24117.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/dvb-frontends/cx24117.c b/drivers/media/dvb-frontends/cx24117.c
index acb965c..af63635 100644
--- a/drivers/media/dvb-frontends/cx24117.c
+++ b/drivers/media/dvb-frontends/cx24117.c
@@ -1043,7 +1043,7 @@ static int cx24117_send_diseqc_msg(struct dvb_frontend *fe,
 	dev_dbg(&state->priv->i2c->dev, ")\n");

 	/* Validate length */
-	if (d->msg_len > 15)
+	if (d->msg_len > sizeof(d->msg))
 		return -EINVAL;

 	/* DiSEqC message */
--
1.9.1