netdev - Re: [PATCH -next,v2] gss_krb5: refactor code to return correct PTR_ERR in krb5

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Message-ID: <ZpEx/Jejy/CiXE5Z@tissot.1015granger.net>
Date: Fri, 12 Jul 2024 09:39:08 -0400
From: Chuck Lever <chuck.lever@...cle.com>
To: Gaosheng Cui <cuigaosheng1@...wei.com>
Cc: trondmy@...nel.org, anna@...nel.org, jlayton@...nel.org, neilb@...e.de,
        kolga@...app.com, Dai.Ngo@...cle.com, tom@...pey.com,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, horms@...nel.org, linux-nfs@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH -next,v2] gss_krb5: refactor code to return correct
 PTR_ERR in krb5_DK

On Fri, Jul 12, 2024 at 03:24:23PM +0800, Gaosheng Cui wrote:
> Refactor the code in krb5_DK to return PTR_ERR when an error occurs.

My understanding of the current code is that if either
crypto_alloc_sync_skcipher() or crypto_sync_skcipher_blocksize()
fails, then krb5_DK() returns -EINVAL. At the only call site for
krb5_DK(), that return code is unconditionally discarded. Thus I
don't see that the proposed change is necessary or improves
anything.


> Signed-off-by: Gaosheng Cui <cuigaosheng1@...wei.com>
> ---
> v2: Update IS_ERR to PTR_ERR, thanks very much!
>  net/sunrpc/auth_gss/gss_krb5_keys.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/net/sunrpc/auth_gss/gss_krb5_keys.c b/net/sunrpc/auth_gss/gss_krb5_keys.c
> index 4eb19c3a54c7..5ac8d06ab2c0 100644
> --- a/net/sunrpc/auth_gss/gss_krb5_keys.c
> +++ b/net/sunrpc/auth_gss/gss_krb5_keys.c
> @@ -164,10 +164,14 @@ static int krb5_DK(const struct gss_krb5_enctype *gk5e,
>  		goto err_return;
>  
>  	cipher = crypto_alloc_sync_skcipher(gk5e->encrypt_name, 0, 0);
> -	if (IS_ERR(cipher))
> +	if (IS_ERR(cipher)) {
> +		ret = PTR_ERR(cipher);
>  		goto err_return;
> +	}
> +
>  	blocksize = crypto_sync_skcipher_blocksize(cipher);
> -	if (crypto_sync_skcipher_setkey(cipher, inkey->data, inkey->len))
> +	ret = crypto_sync_skcipher_setkey(cipher, inkey->data, inkey->len);
> +	if (ret)
>  		goto err_free_cipher;
>  
>  	ret = -ENOMEM;
> -- 
> 2.25.1
> 

-- 
Chuck Lever