netdev - Re: [PATCH net] cdc_ether: Ignore bogus union descriptor for RNDIS devices

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Date:	Thu, 26 Apr 2012 13:56:02 +0200
From:	Oliver Neukum <oliver@...kum.org>
To:	Bjørn Mork <bjorn@...k.no>
Cc:	netdev@...r.kernel.org, linux-usb@...r.kernel.org,
	Markus Kolb <linux-201011@...er-net.de>,
	Iker Salmón San Millán 
	<shaola@...ebian.org>, Jonathan Nieder <jrnieder@...il.com>,
	655387@...s.debian.org, stable@...r.kernel.org
Subject: Re: [PATCH net] cdc_ether: Ignore bogus union descriptor for RNDIS devices

Am Donnerstag, 26. April 2012, 12:55:03 schrieb Bjørn Mork:
> Some RNDIS devices include a bogus CDC Union descriptor pointing
> to non-existing interfaces.  The RNDIS code is already prepared
> to handle devices without a CDC Union descriptor by hardwiring
> the driver to use interfaces 0 and 1, which is correct for the
> devices with the bogus descriptor as well. So we can reuse the
> existing workaround.

Very good, except that this is a bit risky, because we may use
interface 0 without checking that it belongs to us. Could you
add a sanity check that the interface for which probe() is called
is really the control interface in case a workaround is used?

	Regards
		Oliver
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