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authorEric Biggers <ebiggers@google.com>2020-02-25 20:59:16 -0800
committerHerbert Xu <herbert@gondor.apana.org.au>2020-03-06 12:28:22 +1100
commita108dfcff8441193565bb78c4a15bf344ce9b17e (patch)
treec11c2a5a09d222dd546ef1df1ee2a84b0dbde0e6 /crypto/ctr.c
parentb8c0d74a70273cea5724073370fb8ffec9783d20 (diff)
crypto: ctr - simplify error handling in crypto_rfc3686_create()
Simplify the error handling in crypto_rfc3686_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>
Diffstat (limited to 'crypto/ctr.c')
-rw-r--r--crypto/ctr.c29
1 files changed, 9 insertions, 20 deletions
diff --git a/crypto/ctr.c b/crypto/ctr.c
index a8feab621c6c..31ac4ae598e1 100644
--- a/crypto/ctr.c
+++ b/crypto/ctr.c
@@ -260,7 +260,6 @@ static int crypto_rfc3686_create(struct crypto_template *tmpl,
struct skcipher_instance *inst;
struct skcipher_alg *alg;
struct crypto_skcipher_spawn *spawn;
- const char *cipher_name;
u32 mask;
int err;
@@ -272,10 +271,6 @@ static int crypto_rfc3686_create(struct crypto_template *tmpl,
if ((algt->type ^ CRYPTO_ALG_TYPE_SKCIPHER) & algt->mask)
return -EINVAL;
- 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;
@@ -287,7 +282,7 @@ static int crypto_rfc3686_create(struct crypto_template *tmpl,
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;
@@ -296,20 +291,20 @@ static int crypto_rfc3686_create(struct crypto_template *tmpl,
/* We only support 16-byte blocks. */
err = -EINVAL;
if (crypto_skcipher_alg_ivsize(alg) != CTR_RFC3686_BLOCK_SIZE)
- goto err_drop_spawn;
+ goto err_free_inst;
/* Not a stream cipher? */
if (alg->base.cra_blocksize != 1)
- goto err_drop_spawn;
+ goto err_free_inst;
err = -ENAMETOOLONG;
if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
"rfc3686(%s)", alg->base.cra_name) >= CRYPTO_MAX_ALG_NAME)
- goto err_drop_spawn;
+ goto err_free_inst;
if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
"rfc3686(%s)", alg->base.cra_driver_name) >=
CRYPTO_MAX_ALG_NAME)
- goto err_drop_spawn;
+ goto err_free_inst;
inst->alg.base.cra_priority = alg->base.cra_priority;
inst->alg.base.cra_blocksize = 1;
@@ -336,17 +331,11 @@ static int crypto_rfc3686_create(struct crypto_template *tmpl,
inst->free = crypto_rfc3686_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_rfc3686_free(inst);
+ }
+ return err;
}
static struct crypto_template crypto_ctr_tmpls[] = {