linux-kernel - Re: [PATCH v2] KEYS: remove redundant memset

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Date:   Wed, 22 Jul 2020 13:10:56 -0700
From:   Tom Rix <trix@...hat.com>
To:     Joe Perches <joe@...ches.com>, dhowells@...hat.com,
        jarkko.sakkinen@...ux.intel.com, jmorris@...ei.org,
        serge@...lyn.com, denkenz@...il.com, marcel@...tmann.org
Cc:     keyrings@...r.kernel.org, linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] KEYS: remove redundant memset


On 7/22/20 1:02 PM, Joe Perches wrote:
> On Wed, 2020-07-22 at 06:46 -0700, trix@...hat.com wrote:
>> From: Tom Rix <trix@...hat.com>
>>
>> Reviewing use of memset in keyctrl_pkey.c
>>
>> keyctl_pkey_params_get prologue code to set params up
>>
>> 	memset(params, 0, sizeof(*params));
>> 	params->encoding = "raw";
>>
>> keyctl_pkey_query has the same prologue
>> and calls keyctl_pkey_params_get.
>>
>> So remove the prologue.
>>
>> Fixes: 00d60fd3b932 ("KEYS: Provide keyctls to drive the new key type ops for asymmetric keys [ver #2]")
> At best, this is a micro optimization.
Yes
> How is this appropriate for a Fixes: line?
Removing unneeded code is not a fix?
>
>> diff --git a/security/keys/keyctl_pkey.c b/security/keys/keyctl_pkey.c
> []
>> @@ -166,8 +166,6 @@ long keyctl_pkey_query(key_serial_t id,
>>  	struct kernel_pkey_query res;
>>  	long ret;
>>  
>> -	memset(&params, 0, sizeof(params));
>> -
>>  	ret = keyctl_pkey_params_get(id, _info, &params);
>>  	if (ret < 0)
>>  		goto error;