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crypto: authenc - use crypto_grab_ahash() and simplify error paths

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Make the authenc template use the new function crypto_grab_ahash() to
initialize its ahash spawn.

This is needed to make all spawns be initialized in a consistent way.

Also simplify the error handling by taking advantage of crypto_drop_*()
now accepting (as a no-op) spawns that haven't been initialized yet, and
by taking advantage of crypto_grab_*() now handling ERR_PTR() names.

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 19:58:55 -08:00 committed by Herbert Xu
parent 39e7a283b3
commit 37a861adc9
1 changed files with 14 additions and 38 deletions
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52
crypto/authenc.c
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@ -375,11 +375,10 @@ static int crypto_authenc_create(struct crypto_template *tmpl,
struct crypto_attr_type *algt;
u32 mask;
struct aead_instance *inst;
struct authenc_instance_ctx *ctx;
struct hash_alg_common *auth;
struct crypto_alg *auth_base;
struct skcipher_alg *enc;
struct authenc_instance_ctx *ctx;
const char *enc_name;
int err;
algt = crypto_get_attr_type(tb);
@ -391,35 +390,22 @@ static int crypto_authenc_create(struct crypto_template *tmpl,
mask = crypto_requires_sync(algt->type, algt->mask);
auth = ahash_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH,
CRYPTO_ALG_TYPE_AHASH_MASK | mask);
if (IS_ERR(auth))
return PTR_ERR(auth);
auth_base = &auth->base;
enc_name = crypto_attr_alg_name(tb[2]);
err = PTR_ERR(enc_name);
if (IS_ERR(enc_name))
goto out_put_auth;
inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
err = -ENOMEM;
if (!inst)
goto out_put_auth;
return -ENOMEM;
ctx = aead_instance_ctx(inst);
err = crypto_init_ahash_spawn(&ctx->auth, auth,
aead_crypto_instance(inst));
err = crypto_grab_ahash(&ctx->auth, aead_crypto_instance(inst),
crypto_attr_alg_name(tb[1]), 0, mask);
if (err)
goto err_free_inst;
auth = crypto_spawn_ahash_alg(&ctx->auth);
auth_base = &auth->base;
err = crypto_grab_skcipher(&ctx->enc, aead_crypto_instance(inst),
enc_name, 0, mask);
crypto_attr_alg_name(tb[2]), 0, mask);
if (err)
goto err_drop_auth;
goto err_free_inst;
enc = crypto_spawn_skcipher_alg(&ctx->enc);
ctx->reqoff = ALIGN(2 * auth->digestsize + auth_base->cra_alignmask,
@ -430,12 +416,12 @@ static int crypto_authenc_create(struct crypto_template *tmpl,
"authenc(%s,%s)", auth_base->cra_name,
enc->base.cra_name) >=
CRYPTO_MAX_ALG_NAME)
goto err_drop_enc;
goto err_free_inst;
if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
"authenc(%s,%s)", auth_base->cra_driver_name,
enc->base.cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
goto err_drop_enc;
goto err_free_inst;
inst->alg.base.cra_flags = (auth_base->cra_flags |
enc->base.cra_flags) & CRYPTO_ALG_ASYNC;
@ -460,21 +446,11 @@ static int crypto_authenc_create(struct crypto_template *tmpl,
inst->free = crypto_authenc_free;
err = aead_register_instance(tmpl, inst);
if (err)
goto err_drop_enc;
out:
crypto_mod_put(auth_base);
return err;
err_drop_enc:
crypto_drop_skcipher(&ctx->enc);
err_drop_auth:
crypto_drop_ahash(&ctx->auth);
if (err) {
err_free_inst:
kfree(inst);
out_put_auth:
goto out;
crypto_authenc_free(inst);
}
return err;
}
static struct crypto_template crypto_authenc_tmpl = {