linux-kernel - Re: [patch] pcrypt: handle crypto_get_attr

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Date:	Mon, 22 Mar 2010 16:48:36 +0300
From:	Dan Carpenter <error27@...il.com>
To:	Steffen Klassert <steffen.klassert@...unet.com>
Cc:	Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>,
	linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [patch] pcrypt: handle crypto_get_attr_type() errors

On Mon, Mar 22, 2010 at 02:23:42PM +0100, Steffen Klassert wrote:
> On Sun, Mar 21, 2010 at 12:28:47PM +0300, Dan Carpenter wrote:
> > crypto_get_attr_type() can returns ERR_PTRs if there is a problem. 
> > 
> > Signed-off-by: Dan Carpenter <error27@...il.com>
> > 
> > diff --git a/crypto/pcrypt.c b/crypto/pcrypt.c
> > index 8020124..41bd80f 100644
> > --- a/crypto/pcrypt.c
> > +++ b/crypto/pcrypt.c
> > @@ -322,6 +322,8 @@ static struct crypto_instance *pcrypt_alloc_aead(struct rtattr **tb)
> >  	struct crypto_attr_type *algt;
> >  
> >  	algt = crypto_get_attr_type(tb);
> > +	if (IS_ERR(algt))
> > +		return ERR_CAST(algt);
> >  
> >  	alg = crypto_get_attr_alg(tb, algt->type,
> >  				  (algt->mask & CRYPTO_ALG_TYPE_MASK));
> 
> I've just noticed that we are calling crypto_get_attr_type already in
> pcrypt_alloc, so perhaps we could just pass the type and mask to
> pcrypt_alloc_aead. Then we can remove this second call to
> crypto_get_attr_type completely.
> 

Yup.  That works too.  I will send an updated patch.

regards,
dan carpenter

> Steffen
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