linux-kernel - Re: [PATCH 4/8] DMI: Parse memory device (type 17) in SMBIOS

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Date:	Fri, 11 Oct 2013 17:40:48 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	"Chen, Gong" <gong.chen@...ux.intel.com>
Cc:	tony.luck@...el.com, linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org
Subject: Re: [PATCH 4/8] DMI: Parse memory device (type 17) in SMBIOS

On Fri, Oct 11, 2013 at 02:32:42AM -0400, Chen, Gong wrote:
> This patch adds a new interface to decode memory device (type 17)
> to help error reporting on DIMMs.
> 
> Original-author: Tony Luck <tony.luck@...el.com>
> Signed-off-by: Chen, Gong <gong.chen@...ux.intel.com>

Reviewed-by: Borislav Petkov <bp@...e.de>

Just a question below:

> ---
>  arch/ia64/kernel/setup.c    |  1 +
>  arch/x86/kernel/setup.c     |  1 +
>  drivers/firmware/dmi_scan.c | 60 +++++++++++++++++++++++++++++++++++++++++++++
>  include/linux/dmi.h         |  5 ++++
>  4 files changed, 67 insertions(+)
> 

[ ... ]

> diff --git a/drivers/firmware/dmi_scan.c b/drivers/firmware/dmi_scan.c
> index fa0affb..ca3619d 100644
> --- a/drivers/firmware/dmi_scan.c
> +++ b/drivers/firmware/dmi_scan.c
> @@ -25,6 +25,13 @@ static int dmi_initialized;
>  /* DMI system identification string used during boot */
>  static char dmi_ids_string[128] __initdata;
>  
> +static struct dmi_memdev_info {
> +	const char *device;
> +	const char *bank;
> +	u16 handle;
> +} *dmi_memdev;
> +static int dmi_memdev_nr;
> +
>  static const char * __init dmi_string_nosave(const struct dmi_header *dm, u8 s)
>  {
>  	const u8 *bp = ((u8 *) dm) + dm->length;
> @@ -322,6 +329,42 @@ static void __init dmi_save_extended_devices(const struct dmi_header *dm)
>  	dmi_save_one_device(*d & 0x7f, dmi_string_nosave(dm, *(d - 1)));
>  }
>  
> +static void __init count_mem_devices(const struct dmi_header *dm, void *v)
> +{
> +	if (dm->type != DMI_ENTRY_MEM_DEVICE)
> +		return;
> +	dmi_memdev_nr++;
> +}
> +
> +static void __init save_mem_devices(const struct dmi_header *dm, void *v)
> +{
> +	const char *d = (const char *)dm;
> +	static int nr;
> +
> +	if (dm->type != DMI_ENTRY_MEM_DEVICE)
> +		return;
> +	if (nr >= dmi_memdev_nr) {
> +		pr_warn_once("Too many DIMM entries in SMBIOS table\n");
> +		return;

Is this and count_mem_devices() some sort of precaution against insane
DMI tables?

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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