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crypto: akcipher - pass instance to crypto_grab_akcipher()

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Initializing a crypto_akcipher_spawn currently requires:

1. Set spawn->base.inst to point to the instance.
2. Call crypto_grab_akcipher().

But there's no reason for these steps to be separate, and in fact this
unneeded complication has caused at least one bug, the one fixed by
commit 6db4341017 ("crypto: adiantum - initialize crypto_spawn::inst")

So just make crypto_grab_akcipher() take the instance as an argument.

To keep the function call from getting too unwieldy due to this extra
argument, also introduce a 'mask' variable into pkcs1pad_create().

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Eric Biggers 2020-01-02 19:58:47 -08:00 committed by Herbert Xu
parent cd900f0cac
commit 73bed26f73
3 changed files with 12 additions and 14 deletions
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6
crypto/akcipher.c
View File

@ -90,9 +90,11 @@ static const struct crypto_type crypto_akcipher_type = {
.tfmsize = offsetof(struct crypto_akcipher, base),
};
int crypto_grab_akcipher(struct crypto_akcipher_spawn *spawn, const char *name,
u32 type, u32 mask)
int crypto_grab_akcipher(struct crypto_akcipher_spawn *spawn,
struct crypto_instance *inst,
const char *name, u32 type, u32 mask)
{
spawn->base.inst = inst;
spawn->base.frontend = &crypto_akcipher_type;
return crypto_grab_spawn(&spawn->base, name, type, mask);
}

8
crypto/rsa-pkcs1pad.c
View File

@ -598,6 +598,7 @@ static int pkcs1pad_create(struct crypto_template *tmpl, struct rtattr **tb)
{
const struct rsa_asn1_template *digest_info;
struct crypto_attr_type *algt;
u32 mask;
struct akcipher_instance *inst;
struct pkcs1pad_inst_ctx *ctx;
struct crypto_akcipher_spawn *spawn;
@ -613,6 +614,8 @@ static int pkcs1pad_create(struct crypto_template *tmpl, struct rtattr **tb)
if ((algt->type ^ CRYPTO_ALG_TYPE_AKCIPHER) & algt->mask)
return -EINVAL;
mask = crypto_requires_sync(algt->type, algt->mask);
rsa_alg_name = crypto_attr_alg_name(tb[1]);
if (IS_ERR(rsa_alg_name))
return PTR_ERR(rsa_alg_name);
@ -636,9 +639,8 @@ static int pkcs1pad_create(struct crypto_template *tmpl, struct rtattr **tb)
spawn = &ctx->spawn;
ctx->digest_info = digest_info;
crypto_set_spawn(&spawn->base, akcipher_crypto_instance(inst));
err = crypto_grab_akcipher(spawn, rsa_alg_name, 0,
crypto_requires_sync(algt->type, algt->mask));
err = crypto_grab_akcipher(spawn, akcipher_crypto_instance(inst),
rsa_alg_name, 0, mask);
if (err)
goto out_free_inst;

12
include/crypto/internal/akcipher.h
View File

@ -78,15 +78,9 @@ static inline void *akcipher_instance_ctx(struct akcipher_instance *inst)
return crypto_instance_ctx(akcipher_crypto_instance(inst));
}
static inline void crypto_set_akcipher_spawn(
struct crypto_akcipher_spawn *spawn,
struct crypto_instance *inst)
{
crypto_set_spawn(&spawn->base, inst);
}
int crypto_grab_akcipher(struct crypto_akcipher_spawn *spawn, const char *name,
u32 type, u32 mask);
int crypto_grab_akcipher(struct crypto_akcipher_spawn *spawn,
struct crypto_instance *inst,
const char *name, u32 type, u32 mask);
static inline struct crypto_akcipher *crypto_spawn_akcipher(
struct crypto_akcipher_spawn *spawn)