linux-kernel - [PATCH 3.2 56/61] [media] cx231xx-cards: fix NULL-deref on missing association descriptor

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Message-ID: <lsq.1511316666.620149758@decadent.org.uk>
Date:   Wed, 22 Nov 2017 02:11:06 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Andrey Konovalov" <andreyknvl@...gle.com>,
        "Mauro Carvalho Chehab" <mchehab@....samsung.com>,
        "Johan Hovold" <johan@...nel.org>,
        "Hans Verkuil" <hans.verkuil@...co.com>
Subject: [PATCH 3.2 56/61] [media] cx231xx-cards: fix NULL-deref on
 missing association descriptor

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

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

From: Johan Hovold <johan@...nel.org>

commit 6c3b047fa2d2286d5e438bcb470c7b1a49f415f6 upstream.

Make sure to check that we actually have an Interface Association
Descriptor before dereferencing it during probe to avoid dereferencing a
NULL-pointer.

Fixes: e0d3bafd0258 ("V4L/DVB (10954): Add cx231xx USB driver")

Reported-by: Andrey Konovalov <andreyknvl@...gle.com>
Signed-off-by: Johan Hovold <johan@...nel.org>
Tested-by: Andrey Konovalov <andreyknvl@...gle.com>
Signed-off-by: Hans Verkuil <hans.verkuil@...co.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@....samsung.com>
[bwh: Backported to 3.2: adjust filename, context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/media/video/cx231xx/cx231xx-cards.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/media/video/cx231xx/cx231xx-cards.c
+++ b/drivers/media/video/cx231xx/cx231xx-cards.c
@@ -1127,7 +1127,7 @@ static int cx231xx_usb_probe(struct usb_
 	nr = dev->devno;
 
 	assoc_desc = udev->actconfig->intf_assoc[0];
-	if (assoc_desc->bFirstInterface != ifnum) {
+	if (!assoc_desc || assoc_desc->bFirstInterface != ifnum) {
 		cx231xx_err(DRIVER_NAME ": Not found "
 			    "matching IAD interface\n");
 		retval = -ENODEV;