Received-SPF: pass (google.com: best guess record for domain of linux-wireless-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 179F76076A
From:   Kalle Valo <kvalo@codeaurora.org>
To:     Guenter Roeck <linux@roeck-us.net>
Cc:     Hui Peng <benquike@gmail.com>, davem@davemloft.net,
        Mathias Payer <mathias.payer@nebelwelt.net>,
        linux-wireless@vger.kernel.org, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/2] Fix a NULL-ptr-deref bug in ath6kl_usb_alloc_urb_from_pipe
References: <20190804002905.11292-1-benquike@gmail.com>
        <20190831180219.GA20860@roeck-us.net>
Date:   Sun, 01 Sep 2019 10:55:48 +0300
In-Reply-To: <20190831180219.GA20860@roeck-us.net> (Guenter Roeck's message of
        "Sat, 31 Aug 2019 11:02:19 -0700")
Message-ID: <87sgpgqwl7.fsf@kamboji.qca.qualcomm.com>
User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.5 (gnu/linux)
MIME-Version: 1.0
Content-Type: text/plain
Sender: linux-wireless-owner@vger.kernel.org
Precedence: bulk

Guenter Roeck <linux@roeck-us.net> writes:

> On Sat, Aug 03, 2019 at 08:29:04PM -0400, Hui Peng wrote:
>> The `ar_usb` field of `ath6kl_usb_pipe_usb_pipe` objects
>> are initialized to point to the containing `ath6kl_usb` object
>> according to endpoint descriptors read from the device side, as shown
>> below in `ath6kl_usb_setup_pipe_resources`:
>> 
>> for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
>> 	endpoint = &iface_desc->endpoint[i].desc;
>> 
>> 	// get the address from endpoint descriptor
>> 	pipe_num = ath6kl_usb_get_logical_pipe_num(ar_usb,
>> 						endpoint->bEndpointAddress,
>> 						&urbcount);
>> 	......
>> 	// select the pipe object
>> 	pipe = &ar_usb->pipes[pipe_num];
>> 
>> 	// initialize the ar_usb field
>> 	pipe->ar_usb = ar_usb;
>> }
>> 
>> The driver assumes that the addresses reported in endpoint
>> descriptors from device side  to be complete. If a device is
>> malicious and does not report complete addresses, it may trigger
>> NULL-ptr-deref `ath6kl_usb_alloc_urb_from_pipe` and
>> `ath6kl_usb_free_urb_to_pipe`.
>> 
>> This patch fixes the bug by preventing potential NULL-ptr-deref.
>> 
>> Signed-off-by: Hui Peng <benquike@gmail.com>
>> Reported-by: Hui Peng <benquike@gmail.com>
>> Reported-by: Mathias Payer <mathias.payer@nebelwelt.net>
>
> I don't see this patch in the upstream kernel or in -next.
>
> At the same time, it is supposed to fix CVE-2019-15098, which has
> a CVSS v2.0 score of 7.8 (high).
>
> Is this patch going to be applied to the upstream kernel ?

Lately I have been very busy and I have not had a chance to apply ath6kl
nor ath10k patches. This patch is on my queue and my plan is to go
through my patch queue next week.

-- 
https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches