On Thu, Jul 09, 2020 at 03:31:26PM +1000, Herbert Xu wrote:
> Eric Biggers <ebigg...@kernel.org> wrote:
> >
> > @@ -875,14 +873,21 @@ static void cbcmac_exit_tfm(struct crypto_tfm *tfm)
> >
> > static int cbcmac_create(struct crypto_template *tmpl, struct rtattr **tb)
> > {
> > + struct crypto_attr_type *algt;
> > struct shash_instance *inst;
> > struct crypto_cipher_spawn *spawn;
> > struct crypto_alg *alg;
> > + u32 mask;
> > int err;
> >
> > - err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SHASH);
> > - if (err)
> > - return err;
> > + algt = crypto_get_attr_type(tb);
> > + if (IS_ERR(algt))
> > + return PTR_ERR(algt);
> > +
> > + if ((algt->type ^ CRYPTO_ALG_TYPE_SHASH) & algt->mask)
> > + return -EINVAL;
> > +
> > + mask = crypto_algt_inherited_mask(algt);
>
> How about moving the types check into crypto_algt_inherited_mask,
> e.g.,
>
> u32 mask;
> int err;
>
> err = crypto_algt_inherited_mask(tb, CRYPTO_ALG_TYPE_SHASH);
> if (err < 0)
> return err;
>
> mask = err;
>
> This could then be used to simplify other templates too, such as
> gcm.
>
I decided to make crypto_check_attr_type() return the mask instead, and do so
via a pointer argument instead of the return value (so that we don't overload an
errno return value and prevent flag 0x80000000 from working).
Please take a look at v2. Thanks!
- Eric
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