linux-kernel - Re: [PATCH] Crypto: Fix one bug when use kernel ecdsa algorithm

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Message-ID: <ZGc0UdrY9Suaxdjq@gondor.apana.org.au>
Date:   Fri, 19 May 2023 16:33:21 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     yangmengfei1394@...tium.com.cn
Cc:     davem@...emloft.net, linux-crypto@...r.kernel.org,
        linux-kernel@...r.kernel.org, yangmengfei1394@...tium.com.cn
Subject: Re: [PATCH] Crypto: Fix one bug when use kernel ecdsa algorithm

yangmengfei1394@...tium.com.cn wrote:
>
> diff --git a/include/crypto/akcipher.h b/include/crypto/akcipher.h
> index f35fd653e4e5..a68f0e23bf89 100644
> --- a/include/crypto/akcipher.h
> +++ b/include/crypto/akcipher.h
> @@ -459,7 +459,9 @@ static inline int crypto_akcipher_set_priv_key(struct crypto_akcipher *tfm,
>                                               unsigned int keylen)
> {
>        struct akcipher_alg *alg = crypto_akcipher_alg(tfm);
> -
> -       return alg->set_priv_key(tfm, key, keylen);
> +       if (likely(alg->set_priv_key != NULL))
> +               return alg->set_priv_key(tfm, key, keylen);
> +       else
> +               return -EPERM;
> }
> #endif

Instead of doing this, we should move the code that sets the
default functions from crypto_register_akcipher into
akcipher_prepare_alg.

Thanks,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt