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crypto: xts - simplify error handling in ->create()

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Simplify the error handling in the XTS 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 20:59:24 -08:00 committed by Herbert Xu
parent 0708bb4353
commit 732e540953
1 changed files with 11 additions and 17 deletions
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28
crypto/xts.c
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@ -379,15 +379,15 @@ static int create(struct crypto_template *tmpl, struct rtattr **tb)
err = -EINVAL;
if (alg->base.cra_blocksize != XTS_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), "xts",
&alg->base);
if (err)
goto err_drop_spawn;
goto err_free_inst;
err = -EINVAL;
cipher_name = alg->base.cra_name;
@ -400,20 +400,20 @@ static int create(struct crypto_template *tmpl, struct rtattr **tb)
len = strlcpy(ctx->name, cipher_name + 4, sizeof(ctx->name));
if (len < 2 || len >= sizeof(ctx->name))
goto err_drop_spawn;
goto err_free_inst;
if (ctx->name[len - 1] != ')')
goto err_drop_spawn;
goto err_free_inst;
ctx->name[len - 1] = 0;
if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
"xts(%s)", ctx->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;
@ -437,17 +437,11 @@ 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(&ctx->spawn);
if (err) {
err_free_inst:
kfree(inst);
goto out;
free(inst);
}
return err;
}
static struct crypto_template crypto_tmpl = {