Patch "[media] cx231xx-cards: fix NULL-deref on missing association descriptor" has been added to the 4.4-stable tree

Patch "[media] cx231xx-cards: fix NULL-deref on missing association descriptor" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    [media] cx231xx-cards: fix NULL-deref on missing association descriptor

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     cx231xx-cards-fix-null-deref-on-missing-association-descriptor.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 6c3b047fa2d2286d5e438bcb470c7b1a49f415f6 Mon Sep 17 00:00:00 2001
From: Johan Hovold <johan@kernel.org>
Date: Thu, 21 Sep 2017 05:40:18 -0300
Subject: [media] cx231xx-cards: fix NULL-deref on missing association descriptor

From: Johan Hovold <johan@kernel.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@google.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Tested-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/media/usb/cx231xx/cx231xx-cards.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/media/usb/cx231xx/cx231xx-cards.c
+++ b/drivers/media/usb/cx231xx/cx231xx-cards.c
@@ -1672,7 +1672,7 @@ 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) {
 		dev_err(d, "Not found matching IAD interface\n");
 		retval = -ENODEV;
 		goto err_if;


Patches currently in stable-queue which might be from johan@kernel.org are

queue-4.4/cx231xx-cards-fix-null-deref-on-missing-association-descriptor.patch
queue-4.4/clk-ti-dra7-atl-clock-fix-child-node-lookups.patch
queue-4.4/nfc-fix-device-allocation-error-return.patch