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From: Greg KH <gregkh@linuxfoundation.org>
To: Hui Peng <benquike@gmail.com>
Cc: kvalo@codeaurora.org, 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: Sat, 10 Aug 2019 12:13:16 +0200	[thread overview]
Message-ID: <20190810101316.GA25650@kroah.com> (raw)
In-Reply-To: <20190804002905.11292-1-benquike@gmail.com>

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>

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

  reply	other threads:[~2019-08-10 10:13 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 [this message]
2019-08-31 18:02 ` Guenter Roeck
2019-09-01  7:55   ` Kalle Valo
     [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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