From mboxrd@z Thu Jan  1 00:00:00 1970
Return-path: <ath10k-bounces+kvalo=adurom.com@lists.infradead.org>
Received: from mail.kernel.org ([198.145.29.99])
 by bombadil.infradead.org with esmtps (Exim 4.92 #3 (Red Hat Linux))
 id 1hwONL-0003kD-LR
 for ath10k@lists.infradead.org; Sat, 10 Aug 2019 10:13:28 +0000
Date: Sat, 10 Aug 2019 12:13:23 +0200
From: Greg KH <greg@kroah.com>
Subject: Re: [PATCH 2/2] Fix a NULL-ptr-deref bug in
 ath10k_usb_alloc_urb_from_pipe
Message-ID: <20190810101323.GB25650@kroah.com>
References: <20190804003101.11541-1-benquike@gmail.com>
MIME-Version: 1.0
Content-Disposition: inline
In-Reply-To: <20190804003101.11541-1-benquike@gmail.com>
List-Id: <ath10k.lists.infradead.org>
List-Unsubscribe: <http://lists.infradead.org/mailman/options/ath10k>,
 <mailto:ath10k-request@lists.infradead.org?subject=unsubscribe>
List-Archive: <http://lists.infradead.org/pipermail/ath10k/>
List-Post: <mailto:ath10k@lists.infradead.org>
List-Help: <mailto:ath10k-request@lists.infradead.org?subject=help>
List-Subscribe: <http://lists.infradead.org/mailman/listinfo/ath10k>,
 <mailto:ath10k-request@lists.infradead.org?subject=subscribe>
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Sender: "ath10k" <ath10k-bounces@lists.infradead.org>
Errors-To: ath10k-bounces+kvalo=adurom.com@lists.infradead.org
To: Hui Peng <benquike@gmail.com>
Cc: Mathias Payer <mathias.payer@nebelwelt.net>, netdev@vger.kernel.org, linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org, ath10k@lists.infradead.org, davem@davemloft.net, kvalo@codeaurora.org

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@gmail.com>
> Reported-by: Hui Peng <benquike@gmail.com>
> Reported-by: Mathias Payer <mathias.payer@nebelwelt.net>

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

_______________________________________________
ath10k mailing list
ath10k@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/ath10k