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

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Date:   Sat, 10 Aug 2019 12:13:23 +0200
From:   Greg KH <greg@...ah.com>
To:     Hui Peng <benquike@...il.com>
Cc:     kvalo@...eaurora.org, 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

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>

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