linux-kernel - Re: [PATCH] firmware: dmi_scan: Only honor end-of-table for 64-bit tables

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Message-ID: <CAKv+Gu-Wd0xN1ZFR4BYAPRBf2YS+NixLDQQYz6BObm8wQdg2pQ@mail.gmail.com>
Date:	Thu, 30 Apr 2015 12:37:16 +0200
From:	Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:	Jean Delvare <jdelvare@...e.de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Leif Lindholm <leif.lindholm@...aro.org>,
	Matt Fleming <matt.fleming@...el.com>,
	Ivan Khoronzhuk <ivan.khoronzhuk@...ballogic.com>
Subject: Re: [PATCH] firmware: dmi_scan: Only honor end-of-table for 64-bit tables

On 28 April 2015 at 20:41, Jean Delvare <jdelvare@...e.de> wrote:
> From: Jean Delvare <jdelvare@...e.de>
> Subject: firmware: dmi_scan: Only honor end-of-table for 64-bit tables
>
> A 32-bit entry point to a DMI table says how many structures the table
> contains. The SMBIOS specification explicitly says that end-of-table
> markers should be ignored if they are not actually at the end of the
> DMI table. So only honor the end-of-table marker for tables accessed
> through 64-bit entry points, as they do not specify a structure count.
>
> Fixes: fc43026278 ("dmi: add support for SMBIOS 3.0 64-bit entry point")
> Signed-off-by: Jean Delvare <jdelvare@...e.de>
> Cc: Leif Lindholm <leif.lindholm@...aro.org>
> Cc: Matt Fleming <matt.fleming@...el.com>
> Cc: Ard Biesheuvel <ard.biesheuvel@...aro.org>
> ---
>  drivers/firmware/dmi_scan.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> --- linux-4.1-rc1.orig/drivers/firmware/dmi_scan.c      2015-04-28 16:39:00.845282262 +0200
> +++ linux-4.1-rc1/drivers/firmware/dmi_scan.c   2015-04-28 16:47:35.092644748 +0200
> @@ -111,7 +111,7 @@ static void dmi_table(u8 *buf,
>                 /*
>                  * 7.45 End-of-Table (Type 127) [SMBIOS reference spec v3.0.0]

I wrote this comment under the assumption that type #127 was new in
v3, but apparently it is not.
Since you are changing the test below into something non-trivial,
could we perhaps update the comment to explain better what goes on
here?

>                  */
> -               if (dm->type == DMI_ENTRY_END_OF_TABLE)
> +               if (!dmi_num && dm->type == DMI_ENTRY_END_OF_TABLE)
>                         break;
>
>                 data += 2;
>
--
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