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Subject: Re: [PATCH v4 1/2] crypto: talitos - reorder code in
 talitos_edesc_alloc()
From:   Christophe Leroy <christophe.leroy@c-s.fr>
To:     Herbert Xu <herbert@gondor.apana.org.au>,
        "David S. Miller" <davem@davemloft.net>,
        Horia Geanta <horia.geanta@nxp.com>
Cc:     linuxppc-dev@lists.ozlabs.org, linux-crypto@vger.kernel.org,
        stable@vger.kernel.org, linux-kernel@vger.kernel.org
References: <5ed91db5e2976a4c260465c3d027acc9affd2d2b.1545445924.git.christophe.leroy@c-s.fr>
Message-ID: <cfb285c6-5700-194d-d4b2-9cc8601dbc04@c-s.fr>
Date:   Tue, 8 Jan 2019 10:51:41 +0100
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Le 08/01/2019 à 07:56, Christophe Leroy a écrit :
> This patch moves the mapping of IV after the kmalloc(). This
> avoids having to unmap in case kmalloc() fails.
> 
> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>

Cc: stable@vger.kernel.org

> ---
>   new in v4
> 
>   drivers/crypto/talitos.c | 25 +++++++------------------
>   1 file changed, 7 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/crypto/talitos.c b/drivers/crypto/talitos.c
> index 45e20707cef8..54d80e7edb86 100644
> --- a/drivers/crypto/talitos.c
> +++ b/drivers/crypto/talitos.c
> @@ -1361,23 +1361,18 @@ static struct talitos_edesc *talitos_edesc_alloc(struct device *dev,
>   	struct talitos_private *priv = dev_get_drvdata(dev);
>   	bool is_sec1 = has_ftr_sec1(priv);
>   	int max_len = is_sec1 ? TALITOS1_MAX_DATA_LEN : TALITOS2_MAX_DATA_LEN;
> -	void *err;
>   
>   	if (cryptlen + authsize > max_len) {
>   		dev_err(dev, "length exceeds h/w max limit\n");
>   		return ERR_PTR(-EINVAL);
>   	}
>   
> -	if (ivsize)
> -		iv_dma = dma_map_single(dev, iv, ivsize, DMA_TO_DEVICE);
> -
>   	if (!dst || dst == src) {
>   		src_len = assoclen + cryptlen + authsize;
>   		src_nents = sg_nents_for_len(src, src_len);
>   		if (src_nents < 0) {
>   			dev_err(dev, "Invalid number of src SG.\n");
> -			err = ERR_PTR(-EINVAL);
> -			goto error_sg;
> +			return ERR_PTR(-EINVAL);
>   		}
>   		src_nents = (src_nents == 1) ? 0 : src_nents;
>   		dst_nents = dst ? src_nents : 0;
> @@ -1387,16 +1382,14 @@ static struct talitos_edesc *talitos_edesc_alloc(struct device *dev,
>   		src_nents = sg_nents_for_len(src, src_len);
>   		if (src_nents < 0) {
>   			dev_err(dev, "Invalid number of src SG.\n");
> -			err = ERR_PTR(-EINVAL);
> -			goto error_sg;
> +			return ERR_PTR(-EINVAL);
>   		}
>   		src_nents = (src_nents == 1) ? 0 : src_nents;
>   		dst_len = assoclen + cryptlen + (encrypt ? authsize : 0);
>   		dst_nents = sg_nents_for_len(dst, dst_len);
>   		if (dst_nents < 0) {
>   			dev_err(dev, "Invalid number of dst SG.\n");
> -			err = ERR_PTR(-EINVAL);
> -			goto error_sg;
> +			return ERR_PTR(-EINVAL);
>   		}
>   		dst_nents = (dst_nents == 1) ? 0 : dst_nents;
>   	}
> @@ -1425,10 +1418,10 @@ static struct talitos_edesc *talitos_edesc_alloc(struct device *dev,
>   		alloc_len += sizeof(struct talitos_desc);
>   
>   	edesc = kmalloc(alloc_len, GFP_DMA | flags);
> -	if (!edesc) {
> -		err = ERR_PTR(-ENOMEM);
> -		goto error_sg;
> -	}
> +	if (!edesc)
> +		return ERR_PTR(-ENOMEM);
> +	if (ivsize)
> +		iv_dma = dma_map_single(dev, iv, ivsize, DMA_TO_DEVICE);
>   	memset(&edesc->desc, 0, sizeof(edesc->desc));
>   
>   	edesc->src_nents = src_nents;
> @@ -1445,10 +1438,6 @@ static struct talitos_edesc *talitos_edesc_alloc(struct device *dev,
>   						     DMA_BIDIRECTIONAL);
>   	}
>   	return edesc;
> -error_sg:
> -	if (iv_dma)
> -		dma_unmap_single(dev, iv_dma, ivsize, DMA_TO_DEVICE);
> -	return err;
>   }
>   
>   static struct talitos_edesc *aead_edesc_alloc(struct aead_request *areq, u8 *iv,
>