linux-kernel - Re: [PATCH] firmware: dmi_scan: Prevent dmi

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Message-ID: <20150326130651.GC6525@codeblueprint.co.uk>
Date:	Thu, 26 Mar 2015 13:06:52 +0000
From:	Matt Fleming <matt@...eblueprint.co.uk>
To:	Jean Delvare <jdelvare@...e.de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Matt Fleming <matt.fleming@...el.com>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>
Subject: Re: [PATCH] firmware: dmi_scan: Prevent dmi_num integer overflow

On Fri, 20 Mar, at 09:59:47AM, Jean Delvare wrote:
> dmi_num is a u16, dmi_len is a u32, so this construct:
> 
> 	dmi_num = dmi_len / 4;
> 
> would result in an integer overflow for a DMI table larger than
> 256 kB. I've never see such a large table so far, but SMBIOS 3.0
> makes it possible so maybe we'll see such tables in the future.
> 
> So instead of faking a structure count when the entry point does
> not provide it, adjust the loop condition in dmi_table() to properly
> deal with the case where dmi_num is not set.
> 
> Signed-off-by: Jean Delvare <jdelvare@...e.de>
> Cc: Matt Fleming <matt.fleming@...el.com>
> Cc: Ard Biesheuvel <ard.biesheuvel@...aro.org>
> Cc: Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>
> ---
>  drivers/firmware/dmi_scan.c |   22 +++++++---------------
>  1 file changed, 7 insertions(+), 15 deletions(-)

Jean, are you taking this through your tree?

-- 
Matt Fleming, Intel Open Source Technology Center
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