linux-kernel - Re: [PATCH] gx-suspmod: fix "&& 0xff" typo

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Message-ID: <20061109042433.GB589@1wt.eu>
Date:	Thu, 9 Nov 2006 05:24:34 +0100
From:	Willy Tarreau <w@....eu>
To:	Dave Jones <davej@...hat.com>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Andrew Morton <akpm@...l.org>,
	Dave Jones <davej@...emonkey.org.uk>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] gx-suspmod: fix "&& 0xff" typo

On Wed, Nov 08, 2006 at 05:50:07PM -0500, Dave Jones wrote:
> On Thu, Nov 09, 2006 at 01:20:46AM +0300, Alexey Dobriyan wrote:
>  > >  > > -	params->pci_rev = class_rev && 0xff;
>  > >  > > +	params->pci_rev = class_rev & 0xff;
>  > >  >
>  > >  > Hi,
>  > >  > any kind of automated detection on that one?
>  > >
>  > > grep -r "&& 0x" .  seems to be pretty effective modulo
>  > > some false-positives.
>  > 
>  > Obligatory nit-picking:
>  > 
>  > 	grep '&&[ 	]*0[xX][fF]' -r .
> 
> That misses some cases. Like..
> 
> drivers/char/ipmi/ipmi_msghandler.c:                    bmc->id.device_revision && 0x80 >> 7);
> drivers/char/ipmi/ipmi_msghandler.c:                    bmc->id.device_revision && 0x0F);

Interesting grep. I found that cmpci, gdth, net1080 and nv_setup are affected
too in my rather old 2.6.18-rc4 tree. More importantly, I found a few ones in
2.4 that I will have to address.

Thanks guys for the good idea. Once again, it shows that pure code review
would considerably help finding such bugs.

Cheers,
Willy

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