linux-kernel - Re: [PATCH 1/3] ixgbe: Use kzfree() rather than its implementation.

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Date:   Tue, 17 Sep 2019 11:19:56 +0800
From:   zhong jiang <zhongjiang@...wei.com>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>
CC:     <davem@...emloft.net>, <anna.schumaker@...app.com>,
        <trond.myklebust@...merspace.com>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] ixgbe: Use kzfree() rather than its implementation.

On 2019/9/17 10:43, Jakub Kicinski wrote:
> On Wed, 4 Sep 2019 10:39:10 +0800, zhong jiang wrote:
>> Use kzfree() instead of memset() + kfree().
>>
>> Signed-off-by: zhong jiang <zhongjiang@...wei.com>
>> ---
>>  drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c | 9 +++------
>>  1 file changed, 3 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c
>> index 31629fc..113f608 100644
>> --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c
>> +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c
>> @@ -960,11 +960,9 @@ int ixgbe_ipsec_vf_add_sa(struct ixgbe_adapter *adapter, u32 *msgbuf, u32 vf)
>>  	return 0;
>>  
>>  err_aead:
>> -	memset(xs->aead, 0, sizeof(*xs->aead));
>> -	kfree(xs->aead);
>> +	kzfree(xs->aead);
>>  err_xs:
>> -	memset(xs, 0, sizeof(*xs));
>> -	kfree(xs);
>> +	kzfree(xs);
>>  err_out:
>>  	msgbuf[1] = err;
>>  	return err;
>> @@ -1049,8 +1047,7 @@ int ixgbe_ipsec_vf_del_sa(struct ixgbe_adapter *adapter, u32 *msgbuf, u32 vf)
>>  	ixgbe_ipsec_del_sa(xs);
>>  
>>  	/* remove the xs that was made-up in the add request */
>> -	memset(xs, 0, sizeof(*xs));
>> -	kfree(xs);
>> +	kzfree(xs);
>>  
>>  	return 0;
>>  }
> All the crypto cases should really be converted to memzero_explicit().
It's better to do that.  I will repost it in v2.

Thanks,
zhong jiang