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Subject: Re: [PATCH] crypto: hisilicon - Fix return value check in
 hisi_zip_acompress()
To:     Yunfeng Ye <yeyunfeng@huawei.com>, <herbert@gondor.apana.org.au>,
        <davem@davemloft.net>
References: <23be2eb5-8256-0c19-aef9-994974d11c9d@huawei.com>
CC:     <linux-crypto@vger.kernel.org>, <linux-kernel@vger.kernel.org>
From:   Zhou Wang <wangzhou1@hisilicon.com>
Message-ID: <5D831C63.9020500@hisilicon.com>
Date:   Thu, 19 Sep 2019 14:12:51 +0800
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On 2019/9/16 14:38, Yunfeng Ye wrote:
> The return valude of add_comp_head() is int, but @head_size is size_t,
> which is a unsigned type.
> 
> 	size_t head_size;
> 	...
> 	if (head_size < 0)  // it will never work
> 		return -ENOMEM
> 
> Modify the type of @head_size to int, then change the type to size_t
> when invoke hisi_zip_create_req() as a parameter.

Acked-by: Zhou Wang <wangzhou1@hisilicon.com>

This is a bug, thinks for your fix!

Best,
Zhou

> 
> Fixes: 62c455ca853e ("crypto: hisilicon - add HiSilicon ZIP accelerator support")
> Signed-off-by: Yunfeng Ye <yeyunfeng@huawei.com>
> ---
>  drivers/crypto/hisilicon/zip/zip_crypto.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/crypto/hisilicon/zip/zip_crypto.c b/drivers/crypto/hisilicon/zip/zip_crypto.c
> index 5a3f84d..5902354 100644
> --- a/drivers/crypto/hisilicon/zip/zip_crypto.c
> +++ b/drivers/crypto/hisilicon/zip/zip_crypto.c
> @@ -559,7 +559,7 @@ static int hisi_zip_acompress(struct acomp_req *acomp_req)
>  	struct hisi_zip_ctx *ctx = crypto_tfm_ctx(acomp_req->base.tfm);
>  	struct hisi_zip_qp_ctx *qp_ctx = &ctx->qp_ctx[QPC_COMP];
>  	struct hisi_zip_req *req;
> -	size_t head_size;
> +	int head_size;
>  	int ret;
> 
>  	/* let's output compression head now */
> @@ -567,7 +567,7 @@ static int hisi_zip_acompress(struct acomp_req *acomp_req)
>  	if (head_size < 0)
>  		return -ENOMEM;
> 
> -	req = hisi_zip_create_req(acomp_req, qp_ctx, head_size, true);
> +	req = hisi_zip_create_req(acomp_req, qp_ctx, (size_t)head_size, true);
>  	if (IS_ERR(req))
>  		return PTR_ERR(req);
>