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Date:   Wed, 26 Aug 2020 15:27:13 +0200
From:   Corentin Labbe <clabbe.montjoie@gmail.com>
To:     Denis Efremov <efremov@linux.com>
Cc:     linux-crypto@vger.kernel.org,
        Herbert Xu <herbert@gondor.apana.org.au>,
        "David S. Miller" <davem@davemloft.net>
Subject: Re: [PATCH] crypto: sun8i-ss - use kfree_sensitive()
Message-ID: <20200826132713.GB13819@Red>
References: <20200826132451.398651-1-efremov@linux.com>
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On Wed, Aug 26, 2020 at 04:24:51PM +0300, Denis Efremov wrote:
> Use kfree_sensitive() instead of open-coding it.
> 
> Signed-off-by: Denis Efremov <efremov@linux.com>
> ---
>  drivers/crypto/allwinner/sun8i-ss/sun8i-ss-cipher.c | 9 +++------
>  1 file changed, 3 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-cipher.c b/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-cipher.c
> index 7b39b4495571..49d89b31eb6b 100644
> --- a/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-cipher.c
> +++ b/drivers/crypto/allwinner/sun8i-ss/sun8i-ss-cipher.c
> @@ -369,8 +369,7 @@ void sun8i_ss_cipher_exit(struct crypto_tfm *tfm)
>  	struct sun8i_cipher_tfm_ctx *op = crypto_tfm_ctx(tfm);
>  
>  	if (op->key) {
> -		memzero_explicit(op->key, op->keylen);
> -		kfree(op->key);
> +		kfree_sensitive(op->key);
>  	}
>  	crypto_free_skcipher(op->fallback_tfm);
>  	pm_runtime_put_sync(op->ss->dev);
> @@ -394,8 +393,7 @@ int sun8i_ss_aes_setkey(struct crypto_skcipher *tfm, const u8 *key,
>  		return -EINVAL;
>  	}
>  	if (op->key) {
> -		memzero_explicit(op->key, op->keylen);
> -		kfree(op->key);
> +		kfree_sensitive(op->key);
>  	}
>  	op->keylen = keylen;
>  	op->key = kmemdup(key, keylen, GFP_KERNEL | GFP_DMA);
> @@ -420,8 +418,7 @@ int sun8i_ss_des3_setkey(struct crypto_skcipher *tfm, const u8 *key,
>  	}
>  
>  	if (op->key) {
> -		memzero_explicit(op->key, op->keylen);
> -		kfree(op->key);
> +		kfree_sensitive(op->key);
>  	}
>  	op->keylen = keylen;
>  	op->key = kmemdup(key, keylen, GFP_KERNEL | GFP_DMA);
> -- 
> 2.26.2
> 

Hello

Same comment than for your crypto/amlogic patch.
Please remove the "if (op->key)"

Regards