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Subject: Re: [PATCH v3 1/5] tpm: change the end marker of the active_banks
 array to zero
To:     Mimi Zohar <zohar@linux.ibm.com>, <jarkko.sakkinen@linux.intel.com>
CC:     <linux-integrity@vger.kernel.org>,
        <linux-security-module@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>, <silviu.vlasceanu@huawei.com>
References: <20181030154711.2782-1-roberto.sassu@huawei.com>
 <20181030154711.2782-2-roberto.sassu@huawei.com>
 <1540996980.11273.67.camel@linux.ibm.com>
From:   Roberto Sassu <roberto.sassu@huawei.com>
Message-ID: <774004d5-e17c-9f5d-f136-acd671350e7b@huawei.com>
Date:   Mon, 5 Nov 2018 09:07:06 +0100
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On 10/31/2018 3:43 PM, Mimi Zohar wrote:
> On Tue, 2018-10-30 at 16:47 +0100, Roberto Sassu wrote:
>> This patch changes the end marker of the active_banks array from
>> TPM2_ALG_ERROR to zero.
> 
> The patch description is a bit off.
> 
> TPM2_ALG_ERROR is defined as zero.  Since tpm_chip_alloc() calls
> kzalloc to allocate the structure, there is no need to explicitly set
> the active_banks end marker to TPM2_ALG_ERROR, nor is there a need to
> explicitly test for the end marker.
> 
> This patch removes explicitly setting the end marker and changes the
> coding style.

Thanks, I will use the text above as the patch description.

Roberto


>> Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
>> ---
>>   drivers/char/tpm/tpm-interface.c | 2 +-
>>   drivers/char/tpm/tpm2-cmd.c      | 3 ---
>>   2 files changed, 1 insertion(+), 4 deletions(-)
>>
>> diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
>> index 1a803b0cf980..f7fc4b5ee239 100644
>> --- a/drivers/char/tpm/tpm-interface.c
>> +++ b/drivers/char/tpm/tpm-interface.c
>> @@ -1051,7 +1051,7 @@ int tpm_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash)
>>   		memset(digest_list, 0, sizeof(digest_list));
>>   
>>   		for (i = 0; i < ARRAY_SIZE(chip->active_banks) &&
>> -			    chip->active_banks[i] != TPM2_ALG_ERROR; i++) {
>> +			    chip->active_banks[i]; i++) {
>>   			digest_list[i].alg_id = chip->active_banks[i];
>>   			memcpy(digest_list[i].digest, hash, TPM_DIGEST_SIZE);
>>   			count++;
>> diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
>> index c31b490bd41d..046c9d8f3c1e 100644
>> --- a/drivers/char/tpm/tpm2-cmd.c
>> +++ b/drivers/char/tpm/tpm2-cmd.c
>> @@ -908,9 +908,6 @@ static ssize_t tpm2_get_pcr_allocation(struct tpm_chip *chip)
>>   	}
>>   
>>   out:
>> -	if (i < ARRAY_SIZE(chip->active_banks))
>> -		chip->active_banks[i] = TPM2_ALG_ERROR;
>> -
>>   	tpm_buf_destroy(&buf);
>>   
>>   	return rc;
> 

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