linux-kernel - Re: [PATCH v1] crypto: brcm - software fallback for cryptlen zero

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Message-ID: <CAAFb_vpj4HMrXbJGL-skK7NS79YDQtDsCAVpcJOKDc_mTFctbA@mail.gmail.com>
Date:   Fri, 23 Jun 2017 22:44:02 +0530
From:   Raveendra Padasalagi <raveendra.padasalagi@...adcom.com>
To:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Rob Rice <rob.rice@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        Ray Jui <ray.jui@...adcom.com>,
        Steve Lin <steven.lin1@...adcom.com>,
        linux-crypto@...r.kernel.org
Cc:     bcm-kernel-feedback-list <bcm-kernel-feedback-list@...adcom.com>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Raveendra Padasalagi <raveendra.padasalagi@...adcom.com>
Subject: Re: [PATCH v1] crypto: brcm - software fallback for cryptlen zero

Need to consider some more scenarios.
So NAKing this patch. Will send out re-vised version.

Regards,
Raveendra


On Fri, Jun 23, 2017 at 2:24 PM, Raveendra Padasalagi
<raveendra.padasalagi@...adcom.com> wrote:
> Zero length payload requests are not handled in
> Broadcom SPU2 engine, so this patch adds conditional
> check to fallback to software implementation for AES-GCM
> and AES-CCM algorithms.
>
> Fixes: 9d12ba86f818 ("crypto: brcm - Add Broadcom SPU driver")
> Signed-off-by: Raveendra Padasalagi <raveendra.padasalagi@...adcom.com>
> Reviewed-by: Ray Jui <ray.jui@...adcom.com>
> Reviewed-by: Scott Branden <scott.branden@...adcom.com>
> Cc: stable@...r.kernel.org
> ---
>
> Changes in v1:
>  - Added Cc tag in the Signed-off area to send the patch to stable kernel
>
>  drivers/crypto/bcm/cipher.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/crypto/bcm/cipher.c b/drivers/crypto/bcm/cipher.c
> index cc0d5b9..6c80863 100644
> --- a/drivers/crypto/bcm/cipher.c
> +++ b/drivers/crypto/bcm/cipher.c
> @@ -2625,7 +2625,7 @@ static int aead_need_fallback(struct aead_request *req)
>          */
>         if (((ctx->cipher.mode == CIPHER_MODE_GCM) ||
>              (ctx->cipher.mode == CIPHER_MODE_CCM)) &&
> -           (req->assoclen == 0)) {
> +           ((req->assoclen == 0) || (req->cryptlen == 0))) {
>                 if ((rctx->is_encrypt && (req->cryptlen == 0)) ||
>                     (!rctx->is_encrypt && (req->cryptlen == ctx->digestsize))) {
>                         flow_log("AES GCM/CCM needs fallback for 0 len req\n");
> --
> 1.9.1
>