linux-kernel - Re: [dm-devel] [PATCH 1/3 v4] crypto: introduce the flag CRYPTO_ALG_ALLOCATES

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Date:   Tue, 30 Jun 2020 10:57:46 -0700
From:   Eric Biggers <ebiggers@...nel.org>
To:     Mikulas Patocka <mpatocka@...hat.com>
Cc:     Mike Snitzer <msnitzer@...hat.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Zaibo Xu <xuzaibo@...wei.com>, linux-kernel@...r.kernel.org,
        Wei Xu <xuwei5@...ilicon.com>, dm-devel@...hat.com,
        George Cherian <gcherian@...vell.com>,
        linux-crypto@...r.kernel.org,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        "David S. Miller" <davem@...emloft.net>,
        Milan Broz <mbroz@...hat.com>
Subject: Re: [dm-devel] [PATCH 1/3 v4] crypto: introduce the flag
 CRYPTO_ALG_ALLOCATES_MEMORY

On Tue, Jun 30, 2020 at 01:01:16PM -0400, Mikulas Patocka wrote:
> > diff --git a/crypto/pcrypt.c b/crypto/pcrypt.c
> > index 7240e8bbdebb..643f7f1cc91c 100644
> > --- a/crypto/pcrypt.c
> > +++ b/crypto/pcrypt.c
> > @@ -232,12 +232,15 @@ static int pcrypt_create_aead(struct crypto_template *tmpl, struct rtattr **tb,
> >  	struct crypto_attr_type *algt;
> >  	struct aead_instance *inst;
> >  	struct aead_alg *alg;
> > +	u32 mask;
> >  	int err;
> >  
> >  	algt = crypto_get_attr_type(tb);
> >  	if (IS_ERR(algt))
> >  		return PTR_ERR(algt);
> >  
> > +	mask = crypto_alg_inherited_mask(algt->type, algt->mask);
> > +
> >  	inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
> >  	if (!inst)
> >  		return -ENOMEM;
> > @@ -254,7 +257,7 @@ static int pcrypt_create_aead(struct crypto_template *tmpl, struct rtattr **tb,
> >  		goto err_free_inst;
> >  
> >  	err = crypto_grab_aead(&ctx->spawn, aead_crypto_instance(inst),
> > -			       crypto_attr_alg_name(tb[1]), 0, 0);
> > +			       crypto_attr_alg_name(tb[1]), 0, mask);
> >  	if (err)
> >  		goto err_free_inst;
> >  
> 
> I added "mask" there - but there is still a "mask" argument that is 
> unused - is it a bug to have two "mask" variables?

Right, I didn't see that algt->type and algt->mask are already being passed to 
pcrypt_create_aead().  It's redundant because pcrypt_create_aead() has access to
those via crypto_get_attr_type() anyway.

How about just removing those two arguments for now?

- Eric