linux-kernel - Re: btrfs zero divide

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Message-ID: <20130809180441.GB12314@lenny.home.zabbo.net>
Date:	Fri, 9 Aug 2013 11:04:41 -0700
From:	Zach Brown <zab@...hat.com>
To:	Andreas Schwab <schwab@...ux-m68k.org>
Cc:	Josef Bacik <jbacik@...ionio.com>, Thorsten Glaser <tg@...bsd.de>,
	Joe Perches <joe@...ches.com>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Debian GNU/Linux m68k <debian-68k@...ts.debian.org>,
	linux-btrfs@...r.kernel.org,
	Linux Kernel Development <linux-kernel@...r.kernel.org>
Subject: Re: btrfs zero divide

On Fri, Aug 09, 2013 at 02:26:36PM +0200, Andreas Schwab wrote:
> Josef Bacik <jbacik@...ionio.com> writes:
> 
> > So stripe_len shouldn't be 0, if it is you have bigger problems :).
> 
> The bigger problem is that stripe_nr is u64, this is completely bogus.
> The first operand of do_div must be u32.  This goes through the whole
> file.

Definitely.  Can we get some typeof() tricks in the macros to have the
build fail if (when, evidently) someone gets it wrong?

- z
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