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From: Eric Biggers <ebiggers@kernel.org>
To: linux-crypto@vger.kernel.org
Subject: [PATCH 02/12] crypto: ccm - simplify error handling in crypto_rfc4309_create()
Date: Tue, 25 Feb 2020 20:59:14 -0800	[thread overview]
Message-ID: <20200226045924.97053-3-ebiggers@kernel.org> (raw)
In-Reply-To: <20200226045924.97053-1-ebiggers@kernel.org>

From: Eric Biggers <ebiggers@google.com>

Simplify the error handling in crypto_rfc4309_create() by taking
advantage of crypto_grab_aead() now handling an ERR_PTR() name and by
taking advantage of crypto_drop_aead() now accepting (as a no-op) a
spawn that hasn't been grabbed yet.

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 crypto/ccm.c | 29 +++++++++--------------------
 1 file changed, 9 insertions(+), 20 deletions(-)

diff --git a/crypto/ccm.c b/crypto/ccm.c
index 241ecdc5c4e0e..d1fb01bbc8143 100644
--- a/crypto/ccm.c
+++ b/crypto/ccm.c
@@ -717,7 +717,6 @@ static int crypto_rfc4309_create(struct crypto_template *tmpl,
 	struct aead_instance *inst;
 	struct crypto_aead_spawn *spawn;
 	struct aead_alg *alg;
-	const char *ccm_name;
 	int err;
 
 	algt = crypto_get_attr_type(tb);
@@ -729,19 +728,15 @@ static int crypto_rfc4309_create(struct crypto_template *tmpl,
 
 	mask = crypto_requires_sync(algt->type, algt->mask);
 
-	ccm_name = crypto_attr_alg_name(tb[1]);
-	if (IS_ERR(ccm_name))
-		return PTR_ERR(ccm_name);
-
 	inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
 	if (!inst)
 		return -ENOMEM;
 
 	spawn = aead_instance_ctx(inst);
 	err = crypto_grab_aead(spawn, aead_crypto_instance(inst),
-			       ccm_name, 0, mask);
+			       crypto_attr_alg_name(tb[1]), 0, mask);
 	if (err)
-		goto out_free_inst;
+		goto err_free_inst;
 
 	alg = crypto_spawn_aead_alg(spawn);
 
@@ -749,11 +744,11 @@ static int crypto_rfc4309_create(struct crypto_template *tmpl,
 
 	/* We only support 16-byte blocks. */
 	if (crypto_aead_alg_ivsize(alg) != 16)
-		goto out_drop_alg;
+		goto err_free_inst;
 
 	/* Not a stream cipher? */
 	if (alg->base.cra_blocksize != 1)
-		goto out_drop_alg;
+		goto err_free_inst;
 
 	err = -ENAMETOOLONG;
 	if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
@@ -762,7 +757,7 @@ static int crypto_rfc4309_create(struct crypto_template *tmpl,
 	    snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
 		     "rfc4309(%s)", alg->base.cra_driver_name) >=
 	    CRYPTO_MAX_ALG_NAME)
-		goto out_drop_alg;
+		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;
@@ -786,17 +781,11 @@ static int crypto_rfc4309_create(struct crypto_template *tmpl,
 	inst->free = crypto_rfc4309_free;
 
 	err = aead_register_instance(tmpl, inst);
-	if (err)
-		goto out_drop_alg;
-
-out:
+	if (err) {
+err_free_inst:
+		crypto_rfc4309_free(inst);
+	}
 	return err;
-
-out_drop_alg:
-	crypto_drop_aead(spawn);
-out_free_inst:
-	kfree(inst);
-	goto out;
 }
 
 static int crypto_cbcmac_digest_setkey(struct crypto_shash *parent,
-- 
2.25.1


  parent reply	other threads:[~2020-02-26  5:01 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-26  4:59 [PATCH 00/12] crypto: more template instantiation cleanups Eric Biggers
2020-02-26  4:59 ` [PATCH 01/12] crypto: authencesn - fix weird comma-terminated line Eric Biggers
2020-02-26  4:59 ` Eric Biggers [this message]
2020-02-26  4:59 ` [PATCH 03/12] crypto: cryptd - simplify error handling in cryptd_create_*() Eric Biggers
2020-02-26  4:59 ` [PATCH 04/12] crypto: ctr - simplify error handling in crypto_rfc3686_create() Eric Biggers
2020-02-26  4:59 ` [PATCH 05/12] crypto: cts - simplify error handling in crypto_cts_create() Eric Biggers
2020-02-26  4:59 ` [PATCH 06/12] crypto: gcm - simplify error handling in crypto_rfc4106_create() Eric Biggers
2020-02-26  4:59 ` [PATCH 07/12] crypto: gcm - simplify error handling in crypto_rfc4543_create() Eric Biggers
2020-02-26  4:59 ` [PATCH 08/12] crypto: geniv - simply error handling in aead_geniv_alloc() Eric Biggers
2020-02-26  4:59 ` [PATCH 09/12] crypto: lrw - simplify error handling in create() Eric Biggers
2020-02-26  4:59 ` [PATCH 10/12] crypto: pcrypt - simplify error handling in pcrypt_create_aead() Eric Biggers
2020-02-26  4:59 ` [PATCH 11/12] crypto: rsa-pkcs1pad - simplify error handling in pkcs1pad_create() Eric Biggers
2020-02-26  4:59 ` [PATCH 12/12] crypto: xts - simplify error handling in ->create() Eric Biggers
2020-03-06  1:51 ` [PATCH 00/12] crypto: more template instantiation cleanups Herbert Xu

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