linux-kernel - Re: [PATCH v2] crypto: arm64/aes-neonbs - add return value of skcipher_walk_done() in __xts

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Message-ID: <CAKv+Gu_+ab6KuvFdp+=F4M4JYm+eO7tN0ea=1ePrwEdG9tLNmQ@mail.gmail.com>
Date:   Tue, 22 Oct 2019 09:43:00 +0200
From:   Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:     Yunfeng Ye <yeyunfeng@...wei.com>
Cc:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        "open list:HARDWARE RANDOM NUMBER GENERATOR CORE" 
        <linux-crypto@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        hushiyuan@...wei.com, linfeilong@...wei.com
Subject: Re: [PATCH v2] crypto: arm64/aes-neonbs - add return value of
 skcipher_walk_done() in __xts_crypt()

On Tue, 22 Oct 2019 at 09:28, Yunfeng Ye <yeyunfeng@...wei.com> wrote:
>
> A warning is found by the static code analysis tool:
>   "Identical condition 'err', second condition is always false"
>
> Fix this by adding return value of skcipher_walk_done().
>
> Fixes: 67cfa5d3b721 ("crypto: arm64/aes-neonbs - implement ciphertext stealing for XTS")
> Signed-off-by: Yunfeng Ye <yeyunfeng@...wei.com>

Acked-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>

> ---
> v1 -> v2:
>  - update the subject and comment
>  - add return value of skcipher_walk_done()
>
>  arch/arm64/crypto/aes-neonbs-glue.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/arm64/crypto/aes-neonbs-glue.c b/arch/arm64/crypto/aes-neonbs-glue.c
> index ea873b8904c4..e3e27349a9fe 100644
> --- a/arch/arm64/crypto/aes-neonbs-glue.c
> +++ b/arch/arm64/crypto/aes-neonbs-glue.c
> @@ -384,7 +384,7 @@ static int __xts_crypt(struct skcipher_request *req, bool encrypt,
>                         goto xts_tail;
>
>                 kernel_neon_end();
> -               skcipher_walk_done(&walk, nbytes);
> +               err = skcipher_walk_done(&walk, nbytes);
>         }
>
>         if (err || likely(!tail))
> --
> 2.7.4.3
>