linux-kernel - Re: 2.6.28-rc3: usb_hcd_poll_rh_status: array subscript is above array bounds

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Date:	Tue, 4 Nov 2008 11:10:33 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Andrey Borzenkov <arvidjaar@...l.ru>
cc:	USB list <linux-usb@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.28-rc3: usb_hcd_poll_rh_status: array subscript is above
 array bounds

On Tue, 4 Nov 2008, Andrey Borzenkov wrote:

> > I think this is actually a compiler bug.  It certainly has nothing to
> > do with USB.  There was a discussion about it a month or so ago on
> > LKML.
> > 
> 
> 
> 
> Yes this really looks like a compiler bug, "length" hardly can be considered
> constant expression even using very broad definition of "constant".
> 
> What is interesting though, it appears that compiler believes length has
> value of 5. So it will copy one extra byte; and possibly pass incorrect
> length to the caller. I cannot judge whether this garbage can do any harm.

Did you examine the object code?  That's the only way to be sure.

> Dp you know if it was ever reported to gcc folks?

I have no idea.  All I know is what was reported on LKML.

Alan Stern

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