[PATCH 21/22] crypto: qce - add check for xts input length equal to zero

[Stanimir Varbanov]

Hi,

Thanks for the patch!

On 8/7/20 7:20 PM, Andrei Botila wrote:
> From: Andrei Botila <andrei.botila at nxp.com>
> 
> Standardize the way input lengths equal to 0 are handled in all skcipher
> algorithms. All the algorithms return 0 for input lengths equal to zero.
> 
> Signed-off-by: Andrei Botila <andrei.botila at nxp.com>
> ---
>  drivers/crypto/qce/skcipher.c | 3 +++
>  1 file changed, 3 insertions(+)

Reviewed-by: Stanimir Varbanov <svarbanov at mm-sol.com>

> 
> diff --git a/drivers/crypto/qce/skcipher.c b/drivers/crypto/qce/skcipher.c
> index 5630c5addd28..887fd4dc9b43 100644
> --- a/drivers/crypto/qce/skcipher.c
> +++ b/drivers/crypto/qce/skcipher.c
> @@ -223,6 +223,9 @@ static int qce_skcipher_crypt(struct skcipher_request *req, int encrypt)
>  	int keylen;
>  	int ret;
>  
> +	if (!req->cryptlen && IS_XTS(rctx->flags))
> +		return 0;
> +
>  	rctx->flags = tmpl->alg_flags;
>  	rctx->flags |= encrypt ? QCE_ENCRYPT : QCE_DECRYPT;
>  	keylen = IS_XTS(rctx->flags) ? ctx->enc_keylen >> 1 : ctx->enc_keylen;
> 

-- 
regards,
Stan