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
Date: Sun, 01 Sep 2019 10:55:48 +0300 [thread overview]
Message-ID: <87sgpgqwl7.fsf@kamboji.qca.qualcomm.com> (raw)
In-Reply-To: <20190831180219.GA20860@roeck-us.net> (Guenter Roeck's message of "Sat, 31 Aug 2019 11:02:19 -0700")
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
next prev parent reply other threads:[~2019-09-01 7:56 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-04 0:29 [PATCH 1/2] Fix a NULL-ptr-deref bug in ath6kl_usb_alloc_urb_from_pipe Hui Peng
2019-08-10 10:13 ` Greg KH
2019-08-31 18:02 ` Guenter Roeck
2019-09-01 7:55 ` Kalle Valo [this message]
[not found] ` <CAKpmkkXyhuTviRfJG9dG-=Pt0KKdoHaxhXdvW9tSadOoKfnP1w@mail.gmail.com>
2019-09-01 7:58 ` Kalle Valo
2019-09-04 6:23 ` Kalle Valo
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