linux-kernel - Re: 2.6.27: "array subscript is above array bounds" warnings

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Message-ID: <Pine.LNX.4.44L0.0810181050570.1298-100000@netrider.rowland.org>
Date:	Sat, 18 Oct 2008 11:00:06 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Oliver Bock <bock@...-berlin.de>, <linux-kernel@...r.kernel.org>,
	<linux-acpi@...r.kernel.org>, <xfs-masters@....sgi.com>,
	<linux-usb@...r.kernel.org>
Subject: Re: 2.6.27: "array subscript is above array bounds" warnings

On Fri, 17 Oct 2008, Andrew Morton wrote:

> (cc's added)
> 
> On Tue, 14 Oct 2008 22:17:36 +0200 Oliver Bock <bock@...-berlin.de> wrote:
> 
> > Hi all,
> > 
> > FYI, I just came across the following warnings when compiling 2.6.27 
> > (release) using gcc 4.3.2 (Debian 4.3.2-1) on Debian Lenny (i386):

...

> > drivers/usb/core/hcd.c: In function ___usb_hcd_poll_rh_status___:
> > include/asm/string_32.h:75: warning: array subscript is above array bounds

Does this refer to the call to memcpy() in usb_hcd_poll_rh_status()?

Line 75 in string_32.h is part of the __constant_memcpy() function.  
That function should not be involved here because the length argument 
isn't a compile-time constant.

This has to be either a compiler bug or else a bug in the
implementation of memcpy.

Alan Stern

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