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

Commit Message

Andrei Botila Aug. 7, 2020, 4:20 p.m. UTC

From: Andrei Botila <[e-mail]>

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 <[e-mail]>
---
 drivers/crypto/qce/skcipher.c | 3 +++
 1 file changed, 3 insertions(+)

Comments

Stanimir Varbanov Aug. 7, 2020, 5:59 p.m. UTC | #1

Hi,

Thanks for the patch!

On 8/7/20 7:20 PM, Andrei Botila wrote:
> From: Andrei Botila <[e-mail]>
> 
> 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 <[e-mail]>
> ---
>  drivers/crypto/qce/skcipher.c | 3 +++
>  1 file changed, 3 insertions(+)

Reviewed-by: Stanimir Varbanov <[e-mail]>

> 
> 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;
>

Patch

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;