linux-kernel - Re: [PATCH 2/2] Fix a NULL-ptr-deref bug in ath10k_usb_alloc_urb_from

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Message-ID: <87ftlgqw42.fsf@kamboji.qca.qualcomm.com>
Date:   Sun, 01 Sep 2019 11:06:05 +0300
From:   Kalle Valo <kvalo@...eaurora.org>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Hui Peng <benquike@...il.com>, davem@...emloft.net,
        Mathias Payer <mathias.payer@...elwelt.net>,
        ath10k@...ts.infradead.org, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] Fix a NULL-ptr-deref bug in ath10k_usb_alloc_urb_from_pipe

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

> Hi,
>
> On Sat, Aug 03, 2019 at 08:31:01PM -0400, Hui Peng wrote:
>> The `ar_usb` field of `ath10k_usb_pipe_usb_pipe` objects
>> are initialized to point to the containing `ath10k_usb` object
>> according to endpoint descriptors read from the device side, as shown
>> below in `ath10k_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 = ath10k_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 `ath10k_usb_alloc_urb_from_pipe` and
>> `ath10k_usb_free_urb_to_pipe`.
>> 
>> This patch fixes the bug by preventing potential NULL-ptr-deref.
>> 
>> Signed-off-by: Hui Peng <benquike@...il.com>
>> Reported-by: Hui Peng <benquike@...il.com>
>> Reported-by: Mathias Payer <mathias.payer@...elwelt.net>
>
> This patch fixes CVE-2019-15099, which has CVSS scores of 7.5 (CVSS 3.0)
> and 7.8 (CVSS 2.0). Yet, I don't find it in the upstream kernel or in Linux
> next.
>
> Is the patch going to be applied to the upstream kernel anytime soon ?

Same answer as in patch 1:

https://patchwork.kernel.org/patch/11074655/

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