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crypto: cts - simplify error handling in crypto_cts_create()

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Simplify the error handling in crypto_cts_create() by taking advantage
of crypto_grab_skcipher() now handling an ERR_PTR() name and by taking
advantage of crypto_drop_skcipher() now accepting (as a no-op) a spawn
that hasn't been grabbed yet.

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 2020-02-25 20:59:17 -08:00 committed by Herbert Xu
parent a108dfcff8
commit 3ff2bab82f
1 changed files with 8 additions and 19 deletions
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27
crypto/cts.c
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@ -327,7 +327,6 @@ static int crypto_cts_create(struct crypto_template *tmpl, struct rtattr **tb)
struct skcipher_instance *inst;
struct crypto_attr_type *algt;
struct skcipher_alg *alg;
const char *cipher_name;
u32 mask;
int err;
@ -340,10 +339,6 @@ static int crypto_cts_create(struct crypto_template *tmpl, struct rtattr **tb)
mask = crypto_requires_sync(algt->type, algt->mask);
cipher_name = crypto_attr_alg_name(tb[1]);
if (IS_ERR(cipher_name))
return PTR_ERR(cipher_name);
inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
if (!inst)
return -ENOMEM;
@ -351,7 +346,7 @@ static int crypto_cts_create(struct crypto_template *tmpl, struct rtattr **tb)
spawn = skcipher_instance_ctx(inst);
err = crypto_grab_skcipher(spawn, skcipher_crypto_instance(inst),
cipher_name, 0, mask);
crypto_attr_alg_name(tb[1]), 0, mask);
if (err)
goto err_free_inst;
@ -359,15 +354,15 @@ static int crypto_cts_create(struct crypto_template *tmpl, struct rtattr **tb)
err = -EINVAL;
if (crypto_skcipher_alg_ivsize(alg) != alg->base.cra_blocksize)
goto err_drop_spawn;
goto err_free_inst;
if (strncmp(alg->base.cra_name, "cbc(", 4))
goto err_drop_spawn;
goto err_free_inst;
err = crypto_inst_setname(skcipher_crypto_instance(inst), "cts",
&alg->base);
if (err)
goto err_drop_spawn;
goto err_free_inst;
inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
inst->alg.base.cra_priority = alg->base.cra_priority;
@ -391,17 +386,11 @@ static int crypto_cts_create(struct crypto_template *tmpl, struct rtattr **tb)
inst->free = crypto_cts_free;
err = skcipher_register_instance(tmpl, inst);
if (err)
goto err_drop_spawn;
out:
return err;
err_drop_spawn:
crypto_drop_skcipher(spawn);
if (err) {
err_free_inst:
kfree(inst);
goto out;
crypto_cts_free(inst);
}
return err;
}
static struct crypto_template crypto_cts_tmpl = {