linux-kernel - Re: [34-longterm 024/247] USB: prevent buggy hubs from crashing the USB stack

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Message-ID: <Pine.LNX.4.44L0.1106231438530.2033-100000@iolanthe.rowland.org>
Date:	Thu, 23 Jun 2011 14:48:11 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Paul Gortmaker <paul.gortmaker@...driver.com>
cc:	stable@...nel.org, <linux-kernel@...r.kernel.org>,
	<stable-review@...nel.org>, Greg Kroah-Hartman <gregkh@...e.de>
Subject: Re: [34-longterm 024/247] USB: prevent buggy hubs from crashing the
 USB stack

On Thu, 23 Jun 2011, Paul Gortmaker wrote:

> From: Alan Stern <stern@...land.harvard.edu>
> 
>                    -------------------
>     This is a commit scheduled for the next v2.6.34 longterm release.
>     If you see a problem with using this for longterm, please comment.
>                    -------------------
> 
> commit d199c96d41d80a567493e12b8e96ea056a1350c1 upstream.
> 
> If anyone comes across a high-speed hub that (by mistake or by design)
> claims to have no Transaction Translators, plugging a full- or
> low-speed device into it will cause the USB stack to crash.  This
> patch (as1446) prevents the problem by ignoring such devices, since
> the kernel has no way to communicate with them.

This commit had some unexpected fallout.  It shouldn't be merged unless 
the following upstream commits are also merged:

c5c69f3f0dcf9b569c8f3ad67f3af92cfcedac43
cee6a262550f53a13acfefbc1e3e5ff35c96182c
ec95d35a6bd0047f05fe8a21e6c52f8bb418da55

Alan Stern

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