linux-kernel - Re: [patch -next] x86, microcode, AMD: signedness bug in generic_load

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Message-ID: <20110220130950.GC1898@bicker>
Date:	Sun, 20 Feb 2011 16:09:50 +0300
From:	Dan Carpenter <error27@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Andreas Herrmann <andreas.herrmann3@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Borislav Petkov <borislav.petkov@....com>,
	"maintainer:X86 ARCHITECTURE..." <x86@...nel.org>,
	"open list:AMD MICROCODE UPD..." <amd64-microcode@...64.org>,
	open list <linux-kernel@...r.kernel.org>,
	kernel-janitors@...r.kernel.org
Subject: Re: [patch -next] x86, microcode, AMD: signedness bug in
 generic_load_microcode()

On Sun, Feb 20, 2011 at 02:02:14PM +0100, Ingo Molnar wrote:
> 
> * Dan Carpenter <error27@...il.com> wrote:
> 
> > install_equiv_cpu_table() returns type int.  It uses negative error
> > codes so using an unsigned type breaks the error handling.
> 
> How did you notice this btw - did GCC throw a warning?
> 

It's a smatch warning.

arch/x86/kernel/microcode_amd.c +256 generic_load_microcode(12)
	warn: unsigned 'offset' is never less than zero.

regards,
dan carpenter
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