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crypto: lrw - simplify error handling in create()

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Simplify the error handling in the LRW template's ->create() function 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 20:59:21 -08:00 committed by Herbert Xu
parent 376ffe1acb
commit d570631033
1 changed files with 11 additions and 17 deletions
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28
crypto/lrw.c
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@ -343,15 +343,15 @@ static int create(struct crypto_template *tmpl, struct rtattr **tb)
err = -EINVAL;
if (alg->base.cra_blocksize != LRW_BLOCK_SIZE)
goto err_drop_spawn;
goto err_free_inst;
if (crypto_skcipher_alg_ivsize(alg))
goto err_drop_spawn;
goto err_free_inst;
err = crypto_inst_setname(skcipher_crypto_instance(inst), "lrw",
&alg->base);
if (err)
goto err_drop_spawn;
goto err_free_inst;
err = -EINVAL;
cipher_name = alg->base.cra_name;
@ -364,20 +364,20 @@ static int create(struct crypto_template *tmpl, struct rtattr **tb)
len = strlcpy(ecb_name, cipher_name + 4, sizeof(ecb_name));
if (len < 2 || len >= sizeof(ecb_name))
goto err_drop_spawn;
goto err_free_inst;
if (ecb_name[len - 1] != ')')
goto err_drop_spawn;
goto err_free_inst;
ecb_name[len - 1] = 0;
if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
"lrw(%s)", ecb_name) >= CRYPTO_MAX_ALG_NAME) {
err = -ENAMETOOLONG;
goto err_drop_spawn;
goto err_free_inst;
}
} else
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;
@ -403,17 +403,11 @@ static int create(struct crypto_template *tmpl, struct rtattr **tb)
inst->free = 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;
free(inst);
}
return err;
}
static struct crypto_template crypto_tmpl = {