linux-kernel - Re: [Patch v2] firmware: dmi_scan: fix dmi scan to handle "End of Table" structure

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Date:	Wed, 18 Feb 2015 12:18:37 +0200
From:	Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>
To:	Matt Fleming <matt.fleming@...el.com>
CC:	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Leif Lindholm <leif.lindholm@...aro.org>
Subject: Re: [Patch v2] firmware: dmi_scan: fix dmi scan to handle "End of
 Table" structure

Hi, Matt

Could you please pick up this patch.

On 02/05/2015 12:36 PM, Ard Biesheuvel wrote:
> On 4 February 2015 at 14:22, Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org> wrote:
>> The dmi-sysfs should create "End of Table" entry, that is type 127.
>> But after adding initial SMBIOS v3 support the 127-0 entry is not
>> handled any more, as result it's not created in sysfs.
>> This is important because the size of whole DMI table must correspond
>> to sum of all DMI entry sizes.
>>
>> So move "end-of-table" check after it's handled by decode.
>>
>> Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>
> Reviewed-by: Ard Biesheuvel <ard@...aro.org>
>
>> ---
>>
>> v2..v1:
>>          Move end of table check after it's handled instead of removing
>>          Correct commit
>>
>>   drivers/firmware/dmi_scan.c | 13 +++++++------
>>   1 file changed, 7 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/firmware/dmi_scan.c b/drivers/firmware/dmi_scan.c
>> index c5f7b4e..a44b87c 100644
>> --- a/drivers/firmware/dmi_scan.c
>> +++ b/drivers/firmware/dmi_scan.c
>> @@ -93,12 +93,6 @@ static void dmi_table(u8 *buf, int len, int num,
>>                  const struct dmi_header *dm = (const struct dmi_header *)data;
>>
>>                  /*
>> -                * 7.45 End-of-Table (Type 127) [SMBIOS reference spec v3.0.0]
>> -                */
>> -               if (dm->type == DMI_ENTRY_END_OF_TABLE)
>> -                       break;
>> -
>> -               /*
>>                   *  We want to know the total length (formatted area and
>>                   *  strings) before decoding to make sure we won't run off the
>>                   *  table in dmi_decode or dmi_string
>> @@ -108,6 +102,13 @@ static void dmi_table(u8 *buf, int len, int num,
>>                          data++;
>>                  if (data - buf < len - 1)
>>                          decode(dm, private_data);
>> +
>> +               /*
>> +                * 7.45 End-of-Table (Type 127) [SMBIOS reference spec v3.0.0]
>> +                */
>> +               if (dm->type == DMI_ENTRY_END_OF_TABLE)
>> +                       break;
>> +
>>                  data += 2;
>>                  i++;
>>          }
>> --
>> 1.9.1
>>

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