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* [PATCH] crypto: skcipher - Add skcipher_ialg_simple helper
@ 2019-12-06  5:57 Herbert Xu
  2019-12-06 21:47 ` Eric Biggers
  2019-12-18  8:07 ` [v2 PATCH] " Herbert Xu
  0 siblings, 2 replies; 5+ messages in thread
From: Herbert Xu @ 2019-12-06  5:57 UTC (permalink / raw)
  To: Linux Crypto Mailing List, Eric Biggers

This patch introduces the skcipher_ialg_simple helper which fetches
the crypto_alg structure from a simple skcpiher instance's spawn.

This allows us to remove the third argument from the function
skcipher_alloc_instance_simple.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/crypto/cbc.c b/crypto/cbc.c
index dd96bcf4d4b6..b9c718fe9d7d 100644
--- a/crypto/cbc.c
+++ b/crypto/cbc.c
@@ -54,10 +54,12 @@ static int crypto_cbc_create(struct crypto_template *tmpl, struct rtattr **tb)
 	struct crypto_alg *alg;
 	int err;
 
-	inst = skcipher_alloc_instance_simple(tmpl, tb, &alg);
+	inst = skcipher_alloc_instance_simple(tmpl, tb);
 	if (IS_ERR(inst))
 		return PTR_ERR(inst);
 
+	alg = skcipher_ialg_simple(inst);
+
 	err = -EINVAL;
 	if (!is_power_of_2(alg->cra_blocksize))
 		goto out_free_inst;
diff --git a/crypto/cfb.c b/crypto/cfb.c
index 7b68fbb61732..5018db366737 100644
--- a/crypto/cfb.c
+++ b/crypto/cfb.c
@@ -203,10 +203,12 @@ static int crypto_cfb_create(struct crypto_template *tmpl, struct rtattr **tb)
 	struct crypto_alg *alg;
 	int err;
 
-	inst = skcipher_alloc_instance_simple(tmpl, tb, &alg);
+	inst = skcipher_alloc_instance_simple(tmpl, tb);
 	if (IS_ERR(inst))
 		return PTR_ERR(inst);
 
+	alg = skcipher_ialg_simple(inst);
+
 	/* CFB mode is a stream cipher. */
 	inst->alg.base.cra_blocksize = 1;
 
diff --git a/crypto/ctr.c b/crypto/ctr.c
index 70a3fccb82f3..e11e58950c0e 100644
--- a/crypto/ctr.c
+++ b/crypto/ctr.c
@@ -129,10 +129,12 @@ static int crypto_ctr_create(struct crypto_template *tmpl, struct rtattr **tb)
 	struct crypto_alg *alg;
 	int err;
 
-	inst = skcipher_alloc_instance_simple(tmpl, tb, &alg);
+	inst = skcipher_alloc_instance_simple(tmpl, tb);
 	if (IS_ERR(inst))
 		return PTR_ERR(inst);
 
+	alg = skcipher_ialg_simple(inst);
+
 	/* Block size must be >= 4 bytes. */
 	err = -EINVAL;
 	if (alg->cra_blocksize < 4)
diff --git a/crypto/ecb.c b/crypto/ecb.c
index 9d6981ca7d5d..7679c9b84da6 100644
--- a/crypto/ecb.c
+++ b/crypto/ecb.c
@@ -64,10 +64,12 @@ static int crypto_ecb_create(struct crypto_template *tmpl, struct rtattr **tb)
 	struct crypto_alg *alg;
 	int err;
 
-	inst = skcipher_alloc_instance_simple(tmpl, tb, &alg);
+	inst = skcipher_alloc_instance_simple(tmpl, tb);
 	if (IS_ERR(inst))
 		return PTR_ERR(inst);
 
+	alg = skcipher_ialg_simple(inst);
+
 	inst->alg.ivsize = 0; /* ECB mode doesn't take an IV */
 
 	inst->alg.encrypt = crypto_ecb_encrypt;
diff --git a/crypto/keywrap.c b/crypto/keywrap.c
index a155c88105ea..dcf6643f8f15 100644
--- a/crypto/keywrap.c
+++ b/crypto/keywrap.c
@@ -266,10 +266,12 @@ static int crypto_kw_create(struct crypto_template *tmpl, struct rtattr **tb)
 	struct crypto_alg *alg;
 	int err;
 
-	inst = skcipher_alloc_instance_simple(tmpl, tb, &alg);
+	inst = skcipher_alloc_instance_simple(tmpl, tb);
 	if (IS_ERR(inst))
 		return PTR_ERR(inst);
 
+	alg = skcipher_ialg_simple(inst);
+
 	err = -EINVAL;
 	/* Section 5.1 requirement for KW */
 	if (alg->cra_blocksize != sizeof(struct crypto_kw_block))
diff --git a/crypto/ofb.c b/crypto/ofb.c
index 133ff4c7f2c6..d3bbc8bb6889 100644
--- a/crypto/ofb.c
+++ b/crypto/ofb.c
@@ -55,10 +55,12 @@ static int crypto_ofb_create(struct crypto_template *tmpl, struct rtattr **tb)
 	struct crypto_alg *alg;
 	int err;
 
-	inst = skcipher_alloc_instance_simple(tmpl, tb, &alg);
+	inst = skcipher_alloc_instance_simple(tmpl, tb);
 	if (IS_ERR(inst))
 		return PTR_ERR(inst);
 
+	alg = skcipher_ialg_simple(inst);
+
 	/* OFB mode is a stream cipher. */
 	inst->alg.base.cra_blocksize = 1;
 
diff --git a/crypto/pcbc.c b/crypto/pcbc.c
index 862cdb8d8b6c..7a6f8ff98667 100644
--- a/crypto/pcbc.c
+++ b/crypto/pcbc.c
@@ -156,10 +156,12 @@ static int crypto_pcbc_create(struct crypto_template *tmpl, struct rtattr **tb)
 	struct crypto_alg *alg;
 	int err;
 
-	inst = skcipher_alloc_instance_simple(tmpl, tb, &alg);
+	inst = skcipher_alloc_instance_simple(tmpl, tb);
 	if (IS_ERR(inst))
 		return PTR_ERR(inst);
 
+	alg = skcipher_ialg_simple(inst);
+
 	inst->alg.encrypt = crypto_pcbc_encrypt;
 	inst->alg.decrypt = crypto_pcbc_decrypt;
 
diff --git a/crypto/skcipher.c b/crypto/skcipher.c
index bad57f07c45e..d7cc271ed76b 100644
--- a/crypto/skcipher.c
+++ b/crypto/skcipher.c
@@ -953,15 +953,12 @@ static void skcipher_free_instance_simple(struct skcipher_instance *inst)
  *
  * @tmpl: the template being instantiated
  * @tb: the template parameters
- * @cipher_alg_ret: on success, a pointer to the underlying cipher algorithm is
- *		    returned here.  It must be dropped with crypto_mod_put().
  *
  * Return: a pointer to the new instance, or an ERR_PTR().  The caller still
  *	   needs to register the instance.
  */
-struct skcipher_instance *
-skcipher_alloc_instance_simple(struct crypto_template *tmpl, struct rtattr **tb,
-			       struct crypto_alg **cipher_alg_ret)
+struct skcipher_instance *skcipher_alloc_instance_simple(
+	struct crypto_template *tmpl, struct rtattr **tb)
 {
 	struct crypto_attr_type *algt;
 	struct crypto_alg *cipher_alg;
@@ -1018,7 +1015,6 @@ skcipher_alloc_instance_simple(struct crypto_template *tmpl, struct rtattr **tb,
 	inst->alg.init = skcipher_init_tfm_simple;
 	inst->alg.exit = skcipher_exit_tfm_simple;
 
-	*cipher_alg_ret = cipher_alg;
 	return inst;
 
 err_free_inst:
diff --git a/include/crypto/internal/skcipher.h b/include/crypto/internal/skcipher.h
index 921c409fe1b1..ad4a6330ff53 100644
--- a/include/crypto/internal/skcipher.h
+++ b/include/crypto/internal/skcipher.h
@@ -214,9 +214,17 @@ skcipher_cipher_simple(struct crypto_skcipher *tfm)
 
 	return ctx->cipher;
 }
-struct skcipher_instance *
-skcipher_alloc_instance_simple(struct crypto_template *tmpl, struct rtattr **tb,
-			       struct crypto_alg **cipher_alg_ret);
+
+struct skcipher_instance *skcipher_alloc_instance_simple(
+	struct crypto_template *tmpl, struct rtattr **tb);
+
+static inline struct crypto_alg *skcipher_ialg_simple(
+	struct skcipher_instance *inst)
+{
+	struct crypto_spawn *spawn = skcipher_instance_ctx(inst);
+
+	return spawn->alg;
+}
 
 #endif	/* _CRYPTO_INTERNAL_SKCIPHER_H */
 
-- 
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

^ permalink raw reply related	[flat|nested] 5+ messages in thread
* Re: [PATCH] crypto: skcipher - Add skcipher_ialg_simple helper
  2019-12-06  5:57 [PATCH] crypto: skcipher - Add skcipher_ialg_simple helper Herbert Xu
@ 2019-12-06 21:47 ` Eric Biggers
  2019-12-18  8:07 ` [v2 PATCH] " Herbert Xu
  1 sibling, 0 replies; 5+ messages in thread
From: Eric Biggers @ 2019-12-06 21:47 UTC (permalink / raw)
  To: Herbert Xu; +Cc: Linux Crypto Mailing List

On Fri, Dec 06, 2019 at 01:57:04PM +0800, Herbert Xu wrote:
> This patch introduces the skcipher_ialg_simple helper which fetches
> the crypto_alg structure from a simple skcpiher instance's spawn.
> 
> This allows us to remove the third argument from the function
> skcipher_alloc_instance_simple.
> 
> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
> 
> diff --git a/crypto/cbc.c b/crypto/cbc.c
> index dd96bcf4d4b6..b9c718fe9d7d 100644
> --- a/crypto/cbc.c
> +++ b/crypto/cbc.c
> @@ -54,10 +54,12 @@ static int crypto_cbc_create(struct crypto_template *tmpl, struct rtattr **tb)
>  	struct crypto_alg *alg;
>  	int err;
>  
> -	inst = skcipher_alloc_instance_simple(tmpl, tb, &alg);
> +	inst = skcipher_alloc_instance_simple(tmpl, tb);
>  	if (IS_ERR(inst))
>  		return PTR_ERR(inst);
>  
> +	alg = skcipher_ialg_simple(inst);
> +
>  	err = -EINVAL;
>  	if (!is_power_of_2(alg->cra_blocksize))
>  		goto out_free_inst;

This doesn't seem like an improvement, because skcipher_alloc_instance_simple()
takes a reference to 'alg' which the caller must drop.  It's better to make this
explicit by having 'alg' be one of the return values.

- Eric

^ permalink raw reply	[flat|nested] 5+ messages in thread
* [v2 PATCH] crypto: skcipher - Add skcipher_ialg_simple helper
  2019-12-06  5:57 [PATCH] crypto: skcipher - Add skcipher_ialg_simple helper Herbert Xu
  2019-12-06 21:47 ` Eric Biggers
@ 2019-12-18  8:07 ` Herbert Xu
  2019-12-19 20:34   ` Eric Biggers
  1 sibling, 1 reply; 5+ messages in thread
From: Herbert Xu @ 2019-12-18  8:07 UTC (permalink / raw)
  To: Linux Crypto Mailing List, Eric Biggers

This patch introduces the skcipher_ialg_simple helper which fetches
the crypto_alg structure from a simple skcpiher instance's spawn.

This allows us to remove the third argument from the function
skcipher_alloc_instance_simple.

In doing so the reference count to the algorithm is now maintained
by the Crypto API and the caller no longer needs to drop the alg
refcount.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/crypto/cbc.c b/crypto/cbc.c
index dd96bcf4d4b6..e6f6273a7d39 100644
--- a/crypto/cbc.c
+++ b/crypto/cbc.c
@@ -54,10 +54,12 @@ static int crypto_cbc_create(struct crypto_template *tmpl, struct rtattr **tb)
 	struct crypto_alg *alg;
 	int err;
 
-	inst = skcipher_alloc_instance_simple(tmpl, tb, &alg);
+	inst = skcipher_alloc_instance_simple(tmpl, tb);
 	if (IS_ERR(inst))
 		return PTR_ERR(inst);
 
+	alg = skcipher_ialg_simple(inst);
+
 	err = -EINVAL;
 	if (!is_power_of_2(alg->cra_blocksize))
 		goto out_free_inst;
@@ -66,14 +68,11 @@ static int crypto_cbc_create(struct crypto_template *tmpl, struct rtattr **tb)
 	inst->alg.decrypt = crypto_cbc_decrypt;
 
 	err = skcipher_register_instance(tmpl, inst);
-	if (err)
-		goto out_free_inst;
-	goto out_put_alg;
-
+	if (err) {
 out_free_inst:
-	inst->free(inst);
-out_put_alg:
-	crypto_mod_put(alg);
+		inst->free(inst);
+	}
+
 	return err;
 }
 
diff --git a/crypto/cfb.c b/crypto/cfb.c
index 7b68fbb61732..4e5219bbcd19 100644
--- a/crypto/cfb.c
+++ b/crypto/cfb.c
@@ -203,10 +203,12 @@ static int crypto_cfb_create(struct crypto_template *tmpl, struct rtattr **tb)
 	struct crypto_alg *alg;
 	int err;
 
-	inst = skcipher_alloc_instance_simple(tmpl, tb, &alg);
+	inst = skcipher_alloc_instance_simple(tmpl, tb);
 	if (IS_ERR(inst))
 		return PTR_ERR(inst);
 
+	alg = skcipher_ialg_simple(inst);
+
 	/* CFB mode is a stream cipher. */
 	inst->alg.base.cra_blocksize = 1;
 
@@ -223,7 +225,6 @@ static int crypto_cfb_create(struct crypto_template *tmpl, struct rtattr **tb)
 	if (err)
 		inst->free(inst);
 
-	crypto_mod_put(alg);
 	return err;
 }
 
diff --git a/crypto/ctr.c b/crypto/ctr.c
index 70a3fccb82f3..1e9d6b86b3c6 100644
--- a/crypto/ctr.c
+++ b/crypto/ctr.c
@@ -129,10 +129,12 @@ static int crypto_ctr_create(struct crypto_template *tmpl, struct rtattr **tb)
 	struct crypto_alg *alg;
 	int err;
 
-	inst = skcipher_alloc_instance_simple(tmpl, tb, &alg);
+	inst = skcipher_alloc_instance_simple(tmpl, tb);
 	if (IS_ERR(inst))
 		return PTR_ERR(inst);
 
+	alg = skcipher_ialg_simple(inst);
+
 	/* Block size must be >= 4 bytes. */
 	err = -EINVAL;
 	if (alg->cra_blocksize < 4)
@@ -155,14 +157,11 @@ static int crypto_ctr_create(struct crypto_template *tmpl, struct rtattr **tb)
 	inst->alg.decrypt = crypto_ctr_crypt;
 
 	err = skcipher_register_instance(tmpl, inst);
-	if (err)
-		goto out_free_inst;
-	goto out_put_alg;
-
+	if (err) {
 out_free_inst:
-	inst->free(inst);
-out_put_alg:
-	crypto_mod_put(alg);
+		inst->free(inst);
+	}
+
 	return err;
 }
 
diff --git a/crypto/ecb.c b/crypto/ecb.c
index 9d6981ca7d5d..249aca75b7dc 100644
--- a/crypto/ecb.c
+++ b/crypto/ecb.c
@@ -64,10 +64,12 @@ static int crypto_ecb_create(struct crypto_template *tmpl, struct rtattr **tb)
 	struct crypto_alg *alg;
 	int err;
 
-	inst = skcipher_alloc_instance_simple(tmpl, tb, &alg);
+	inst = skcipher_alloc_instance_simple(tmpl, tb);
 	if (IS_ERR(inst))
 		return PTR_ERR(inst);
 
+	alg = skcipher_ialg_simple(inst);
+
 	inst->alg.ivsize = 0; /* ECB mode doesn't take an IV */
 
 	inst->alg.encrypt = crypto_ecb_encrypt;
@@ -76,7 +78,7 @@ static int crypto_ecb_create(struct crypto_template *tmpl, struct rtattr **tb)
 	err = skcipher_register_instance(tmpl, inst);
 	if (err)
 		inst->free(inst);
-	crypto_mod_put(alg);
+
 	return err;
 }
 
diff --git a/crypto/keywrap.c b/crypto/keywrap.c
index a155c88105ea..0355cce21b1e 100644
--- a/crypto/keywrap.c
+++ b/crypto/keywrap.c
@@ -266,10 +266,12 @@ static int crypto_kw_create(struct crypto_template *tmpl, struct rtattr **tb)
 	struct crypto_alg *alg;
 	int err;
 
-	inst = skcipher_alloc_instance_simple(tmpl, tb, &alg);
+	inst = skcipher_alloc_instance_simple(tmpl, tb);
 	if (IS_ERR(inst))
 		return PTR_ERR(inst);
 
+	alg = skcipher_ialg_simple(inst);
+
 	err = -EINVAL;
 	/* Section 5.1 requirement for KW */
 	if (alg->cra_blocksize != sizeof(struct crypto_kw_block))
@@ -283,14 +285,11 @@ static int crypto_kw_create(struct crypto_template *tmpl, struct rtattr **tb)
 	inst->alg.decrypt = crypto_kw_decrypt;
 
 	err = skcipher_register_instance(tmpl, inst);
-	if (err)
-		goto out_free_inst;
-	goto out_put_alg;
-
+	if (err) {
 out_free_inst:
-	inst->free(inst);
-out_put_alg:
-	crypto_mod_put(alg);
+		inst->free(inst);
+	}
+
 	return err;
 }
 
diff --git a/crypto/ofb.c b/crypto/ofb.c
index 133ff4c7f2c6..2ec68e3f2c55 100644
--- a/crypto/ofb.c
+++ b/crypto/ofb.c
@@ -55,10 +55,12 @@ static int crypto_ofb_create(struct crypto_template *tmpl, struct rtattr **tb)
 	struct crypto_alg *alg;
 	int err;
 
-	inst = skcipher_alloc_instance_simple(tmpl, tb, &alg);
+	inst = skcipher_alloc_instance_simple(tmpl, tb);
 	if (IS_ERR(inst))
 		return PTR_ERR(inst);
 
+	alg = skcipher_ialg_simple(inst);
+
 	/* OFB mode is a stream cipher. */
 	inst->alg.base.cra_blocksize = 1;
 
@@ -75,7 +77,6 @@ static int crypto_ofb_create(struct crypto_template *tmpl, struct rtattr **tb)
 	if (err)
 		inst->free(inst);
 
-	crypto_mod_put(alg);
 	return err;
 }
 
diff --git a/crypto/pcbc.c b/crypto/pcbc.c
index 862cdb8d8b6c..5c5245647208 100644
--- a/crypto/pcbc.c
+++ b/crypto/pcbc.c
@@ -156,17 +156,19 @@ static int crypto_pcbc_create(struct crypto_template *tmpl, struct rtattr **tb)
 	struct crypto_alg *alg;
 	int err;
 
-	inst = skcipher_alloc_instance_simple(tmpl, tb, &alg);
+	inst = skcipher_alloc_instance_simple(tmpl, tb);
 	if (IS_ERR(inst))
 		return PTR_ERR(inst);
 
+	alg = skcipher_ialg_simple(inst);
+
 	inst->alg.encrypt = crypto_pcbc_encrypt;
 	inst->alg.decrypt = crypto_pcbc_decrypt;
 
 	err = skcipher_register_instance(tmpl, inst);
 	if (err)
 		inst->free(inst);
-	crypto_mod_put(alg);
+
 	return err;
 }
 
diff --git a/crypto/skcipher.c b/crypto/skcipher.c
index 39a718d99220..37adb71f7759 100644
--- a/crypto/skcipher.c
+++ b/crypto/skcipher.c
@@ -938,15 +938,12 @@ static void skcipher_free_instance_simple(struct skcipher_instance *inst)
  *
  * @tmpl: the template being instantiated
  * @tb: the template parameters
- * @cipher_alg_ret: on success, a pointer to the underlying cipher algorithm is
- *		    returned here.  It must be dropped with crypto_mod_put().
  *
  * Return: a pointer to the new instance, or an ERR_PTR().  The caller still
  *	   needs to register the instance.
  */
-struct skcipher_instance *
-skcipher_alloc_instance_simple(struct crypto_template *tmpl, struct rtattr **tb,
-			       struct crypto_alg **cipher_alg_ret)
+struct skcipher_instance *skcipher_alloc_instance_simple(
+	struct crypto_template *tmpl, struct rtattr **tb)
 {
 	struct crypto_attr_type *algt;
 	struct crypto_alg *cipher_alg;
@@ -982,6 +979,7 @@ skcipher_alloc_instance_simple(struct crypto_template *tmpl, struct rtattr **tb,
 	if (err)
 		goto err_free_inst;
 
+	spawn->dropref = true;
 	err = crypto_init_spawn(spawn, cipher_alg,
 				skcipher_crypto_instance(inst),
 				CRYPTO_ALG_TYPE_MASK);
@@ -1003,7 +1001,6 @@ skcipher_alloc_instance_simple(struct crypto_template *tmpl, struct rtattr **tb,
 	inst->alg.init = skcipher_init_tfm_simple;
 	inst->alg.exit = skcipher_exit_tfm_simple;
 
-	*cipher_alg_ret = cipher_alg;
 	return inst;
 
 err_free_inst:
diff --git a/include/crypto/internal/skcipher.h b/include/crypto/internal/skcipher.h
index 921c409fe1b1..ad4a6330ff53 100644
--- a/include/crypto/internal/skcipher.h
+++ b/include/crypto/internal/skcipher.h
@@ -214,9 +214,17 @@ skcipher_cipher_simple(struct crypto_skcipher *tfm)
 
 	return ctx->cipher;
 }
-struct skcipher_instance *
-skcipher_alloc_instance_simple(struct crypto_template *tmpl, struct rtattr **tb,
-			       struct crypto_alg **cipher_alg_ret);
+
+struct skcipher_instance *skcipher_alloc_instance_simple(
+	struct crypto_template *tmpl, struct rtattr **tb);
+
+static inline struct crypto_alg *skcipher_ialg_simple(
+	struct skcipher_instance *inst)
+{
+	struct crypto_spawn *spawn = skcipher_instance_ctx(inst);
+
+	return spawn->alg;
+}
 
 #endif	/* _CRYPTO_INTERNAL_SKCIPHER_H */
 
-- 
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

^ permalink raw reply related	[flat|nested] 5+ messages in thread
* Re: [v2 PATCH] crypto: skcipher - Add skcipher_ialg_simple helper
  2019-12-18  8:07 ` [v2 PATCH] " Herbert Xu
@ 2019-12-19 20:34   ` Eric Biggers
  2019-12-20  5:29     ` [v3 " Herbert Xu
  0 siblings, 1 reply; 5+ messages in thread
From: Eric Biggers @ 2019-12-19 20:34 UTC (permalink / raw)
  To: Herbert Xu; +Cc: Linux Crypto Mailing List

On Wed, Dec 18, 2019 at 04:07:33PM +0800, Herbert Xu wrote:
> This patch introduces the skcipher_ialg_simple helper which fetches
> the crypto_alg structure from a simple skcpiher instance's spawn.

Typo: skcpiher => skcipher

> diff --git a/crypto/ecb.c b/crypto/ecb.c
> index 9d6981ca7d5d..249aca75b7dc 100644
> --- a/crypto/ecb.c
> +++ b/crypto/ecb.c
> @@ -64,10 +64,12 @@ static int crypto_ecb_create(struct crypto_template *tmpl, struct rtattr **tb)
>  	struct crypto_alg *alg;
>  	int err;
>  
> -	inst = skcipher_alloc_instance_simple(tmpl, tb, &alg);
> +	inst = skcipher_alloc_instance_simple(tmpl, tb);
>  	if (IS_ERR(inst))
>  		return PTR_ERR(inst);
>  
> +	alg = skcipher_ialg_simple(inst);
> +
>  	inst->alg.ivsize = 0; /* ECB mode doesn't take an IV */
>  
>  	inst->alg.encrypt = crypto_ecb_encrypt;
> @@ -76,7 +78,7 @@ static int crypto_ecb_create(struct crypto_template *tmpl, struct rtattr **tb)
>  	err = skcipher_register_instance(tmpl, inst);
>  	if (err)
>  		inst->free(inst);
> -	crypto_mod_put(alg);
> +
>  	return err;
>  }

For ecb, 'alg' isn't used anymore, so it should just be removed.

> diff --git a/crypto/pcbc.c b/crypto/pcbc.c
> index 862cdb8d8b6c..5c5245647208 100644
> --- a/crypto/pcbc.c
> +++ b/crypto/pcbc.c
> @@ -156,17 +156,19 @@ static int crypto_pcbc_create(struct crypto_template *tmpl, struct rtattr **tb)
>  	struct crypto_alg *alg;
>  	int err;
>  
> -	inst = skcipher_alloc_instance_simple(tmpl, tb, &alg);
> +	inst = skcipher_alloc_instance_simple(tmpl, tb);
>  	if (IS_ERR(inst))
>  		return PTR_ERR(inst);
>  
> +	alg = skcipher_ialg_simple(inst);
> +
>  	inst->alg.encrypt = crypto_pcbc_encrypt;
>  	inst->alg.decrypt = crypto_pcbc_decrypt;
>  
>  	err = skcipher_register_instance(tmpl, inst);
>  	if (err)
>  		inst->free(inst);
> -	crypto_mod_put(alg);
> +
>  	return err;
>  }

Same for pcbc.

- Eric

^ permalink raw reply	[flat|nested] 5+ messages in thread
* [v3 PATCH] crypto: skcipher - Add skcipher_ialg_simple helper
  2019-12-19 20:34   ` Eric Biggers
@ 2019-12-20  5:29     ` Herbert Xu
  0 siblings, 0 replies; 5+ messages in thread
From: Herbert Xu @ 2019-12-20  5:29 UTC (permalink / raw)
  To: Eric Biggers; +Cc: Linux Crypto Mailing List

On Thu, Dec 19, 2019 at 12:34:00PM -0800, Eric Biggers wrote:
> On Wed, Dec 18, 2019 at 04:07:33PM +0800, Herbert Xu wrote:
> > This patch introduces the skcipher_ialg_simple helper which fetches
> > the crypto_alg structure from a simple skcpiher instance's spawn.
> 
> Typo: skcpiher => skcipher

...

> For ecb, 'alg' isn't used anymore, so it should just be removed.

Thanks for the review.  Here is an update:

---8<---
This patch introduces the skcipher_ialg_simple helper which fetches
the crypto_alg structure from a simple skcipher instance's spawn.

This allows us to remove the third argument from the function
skcipher_alloc_instance_simple.

In doing so the reference count to the algorithm is now maintained
by the Crypto API and the caller no longer needs to drop the alg
refcount.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/crypto/cbc.c b/crypto/cbc.c
index dd96bcf4d4b6..e6f6273a7d39 100644
--- a/crypto/cbc.c
+++ b/crypto/cbc.c
@@ -54,10 +54,12 @@ static int crypto_cbc_create(struct crypto_template *tmpl, struct rtattr **tb)
 	struct crypto_alg *alg;
 	int err;
 
-	inst = skcipher_alloc_instance_simple(tmpl, tb, &alg);
+	inst = skcipher_alloc_instance_simple(tmpl, tb);
 	if (IS_ERR(inst))
 		return PTR_ERR(inst);
 
+	alg = skcipher_ialg_simple(inst);
+
 	err = -EINVAL;
 	if (!is_power_of_2(alg->cra_blocksize))
 		goto out_free_inst;
@@ -66,14 +68,11 @@ static int crypto_cbc_create(struct crypto_template *tmpl, struct rtattr **tb)
 	inst->alg.decrypt = crypto_cbc_decrypt;
 
 	err = skcipher_register_instance(tmpl, inst);
-	if (err)
-		goto out_free_inst;
-	goto out_put_alg;
-
+	if (err) {
 out_free_inst:
-	inst->free(inst);
-out_put_alg:
-	crypto_mod_put(alg);
+		inst->free(inst);
+	}
+
 	return err;
 }
 
diff --git a/crypto/cfb.c b/crypto/cfb.c
index 7b68fbb61732..4e5219bbcd19 100644
--- a/crypto/cfb.c
+++ b/crypto/cfb.c
@@ -203,10 +203,12 @@ static int crypto_cfb_create(struct crypto_template *tmpl, struct rtattr **tb)
 	struct crypto_alg *alg;
 	int err;
 
-	inst = skcipher_alloc_instance_simple(tmpl, tb, &alg);
+	inst = skcipher_alloc_instance_simple(tmpl, tb);
 	if (IS_ERR(inst))
 		return PTR_ERR(inst);
 
+	alg = skcipher_ialg_simple(inst);
+
 	/* CFB mode is a stream cipher. */
 	inst->alg.base.cra_blocksize = 1;
 
@@ -223,7 +225,6 @@ static int crypto_cfb_create(struct crypto_template *tmpl, struct rtattr **tb)
 	if (err)
 		inst->free(inst);
 
-	crypto_mod_put(alg);
 	return err;
 }
 
diff --git a/crypto/ctr.c b/crypto/ctr.c
index 70a3fccb82f3..1e9d6b86b3c6 100644
--- a/crypto/ctr.c
+++ b/crypto/ctr.c
@@ -129,10 +129,12 @@ static int crypto_ctr_create(struct crypto_template *tmpl, struct rtattr **tb)
 	struct crypto_alg *alg;
 	int err;
 
-	inst = skcipher_alloc_instance_simple(tmpl, tb, &alg);
+	inst = skcipher_alloc_instance_simple(tmpl, tb);
 	if (IS_ERR(inst))
 		return PTR_ERR(inst);
 
+	alg = skcipher_ialg_simple(inst);
+
 	/* Block size must be >= 4 bytes. */
 	err = -EINVAL;
 	if (alg->cra_blocksize < 4)
@@ -155,14 +157,11 @@ static int crypto_ctr_create(struct crypto_template *tmpl, struct rtattr **tb)
 	inst->alg.decrypt = crypto_ctr_crypt;
 
 	err = skcipher_register_instance(tmpl, inst);
-	if (err)
-		goto out_free_inst;
-	goto out_put_alg;
-
+	if (err) {
 out_free_inst:
-	inst->free(inst);
-out_put_alg:
-	crypto_mod_put(alg);
+		inst->free(inst);
+	}
+
 	return err;
 }
 
diff --git a/crypto/ecb.c b/crypto/ecb.c
index 9d6981ca7d5d..69a687cbdf21 100644
--- a/crypto/ecb.c
+++ b/crypto/ecb.c
@@ -61,10 +61,9 @@ static int crypto_ecb_decrypt(struct skcipher_request *req)
 static int crypto_ecb_create(struct crypto_template *tmpl, struct rtattr **tb)
 {
 	struct skcipher_instance *inst;
-	struct crypto_alg *alg;
 	int err;
 
-	inst = skcipher_alloc_instance_simple(tmpl, tb, &alg);
+	inst = skcipher_alloc_instance_simple(tmpl, tb);
 	if (IS_ERR(inst))
 		return PTR_ERR(inst);
 
@@ -76,7 +75,7 @@ static int crypto_ecb_create(struct crypto_template *tmpl, struct rtattr **tb)
 	err = skcipher_register_instance(tmpl, inst);
 	if (err)
 		inst->free(inst);
-	crypto_mod_put(alg);
+
 	return err;
 }
 
diff --git a/crypto/keywrap.c b/crypto/keywrap.c
index a155c88105ea..0355cce21b1e 100644
--- a/crypto/keywrap.c
+++ b/crypto/keywrap.c
@@ -266,10 +266,12 @@ static int crypto_kw_create(struct crypto_template *tmpl, struct rtattr **tb)
 	struct crypto_alg *alg;
 	int err;
 
-	inst = skcipher_alloc_instance_simple(tmpl, tb, &alg);
+	inst = skcipher_alloc_instance_simple(tmpl, tb);
 	if (IS_ERR(inst))
 		return PTR_ERR(inst);
 
+	alg = skcipher_ialg_simple(inst);
+
 	err = -EINVAL;
 	/* Section 5.1 requirement for KW */
 	if (alg->cra_blocksize != sizeof(struct crypto_kw_block))
@@ -283,14 +285,11 @@ static int crypto_kw_create(struct crypto_template *tmpl, struct rtattr **tb)
 	inst->alg.decrypt = crypto_kw_decrypt;
 
 	err = skcipher_register_instance(tmpl, inst);
-	if (err)
-		goto out_free_inst;
-	goto out_put_alg;
-
+	if (err) {
 out_free_inst:
-	inst->free(inst);
-out_put_alg:
-	crypto_mod_put(alg);
+		inst->free(inst);
+	}
+
 	return err;
 }
 
diff --git a/crypto/ofb.c b/crypto/ofb.c
index 133ff4c7f2c6..2ec68e3f2c55 100644
--- a/crypto/ofb.c
+++ b/crypto/ofb.c
@@ -55,10 +55,12 @@ static int crypto_ofb_create(struct crypto_template *tmpl, struct rtattr **tb)
 	struct crypto_alg *alg;
 	int err;
 
-	inst = skcipher_alloc_instance_simple(tmpl, tb, &alg);
+	inst = skcipher_alloc_instance_simple(tmpl, tb);
 	if (IS_ERR(inst))
 		return PTR_ERR(inst);
 
+	alg = skcipher_ialg_simple(inst);
+
 	/* OFB mode is a stream cipher. */
 	inst->alg.base.cra_blocksize = 1;
 
@@ -75,7 +77,6 @@ static int crypto_ofb_create(struct crypto_template *tmpl, struct rtattr **tb)
 	if (err)
 		inst->free(inst);
 
-	crypto_mod_put(alg);
 	return err;
 }
 
diff --git a/crypto/pcbc.c b/crypto/pcbc.c
index 862cdb8d8b6c..ae921fb74dc9 100644
--- a/crypto/pcbc.c
+++ b/crypto/pcbc.c
@@ -153,10 +153,9 @@ static int crypto_pcbc_decrypt(struct skcipher_request *req)
 static int crypto_pcbc_create(struct crypto_template *tmpl, struct rtattr **tb)
 {
 	struct skcipher_instance *inst;
-	struct crypto_alg *alg;
 	int err;
 
-	inst = skcipher_alloc_instance_simple(tmpl, tb, &alg);
+	inst = skcipher_alloc_instance_simple(tmpl, tb);
 	if (IS_ERR(inst))
 		return PTR_ERR(inst);
 
@@ -166,7 +165,7 @@ static int crypto_pcbc_create(struct crypto_template *tmpl, struct rtattr **tb)
 	err = skcipher_register_instance(tmpl, inst);
 	if (err)
 		inst->free(inst);
-	crypto_mod_put(alg);
+
 	return err;
 }
 
diff --git a/crypto/skcipher.c b/crypto/skcipher.c
index 39a718d99220..37adb71f7759 100644
--- a/crypto/skcipher.c
+++ b/crypto/skcipher.c
@@ -938,15 +938,12 @@ static void skcipher_free_instance_simple(struct skcipher_instance *inst)
  *
  * @tmpl: the template being instantiated
  * @tb: the template parameters
- * @cipher_alg_ret: on success, a pointer to the underlying cipher algorithm is
- *		    returned here.  It must be dropped with crypto_mod_put().
  *
  * Return: a pointer to the new instance, or an ERR_PTR().  The caller still
  *	   needs to register the instance.
  */
-struct skcipher_instance *
-skcipher_alloc_instance_simple(struct crypto_template *tmpl, struct rtattr **tb,
-			       struct crypto_alg **cipher_alg_ret)
+struct skcipher_instance *skcipher_alloc_instance_simple(
+	struct crypto_template *tmpl, struct rtattr **tb)
 {
 	struct crypto_attr_type *algt;
 	struct crypto_alg *cipher_alg;
@@ -982,6 +979,7 @@ skcipher_alloc_instance_simple(struct crypto_template *tmpl, struct rtattr **tb,
 	if (err)
 		goto err_free_inst;
 
+	spawn->dropref = true;
 	err = crypto_init_spawn(spawn, cipher_alg,
 				skcipher_crypto_instance(inst),
 				CRYPTO_ALG_TYPE_MASK);
@@ -1003,7 +1001,6 @@ skcipher_alloc_instance_simple(struct crypto_template *tmpl, struct rtattr **tb,
 	inst->alg.init = skcipher_init_tfm_simple;
 	inst->alg.exit = skcipher_exit_tfm_simple;
 
-	*cipher_alg_ret = cipher_alg;
 	return inst;
 
 err_free_inst:
diff --git a/include/crypto/internal/skcipher.h b/include/crypto/internal/skcipher.h
index 921c409fe1b1..ad4a6330ff53 100644
--- a/include/crypto/internal/skcipher.h
+++ b/include/crypto/internal/skcipher.h
@@ -214,9 +214,17 @@ skcipher_cipher_simple(struct crypto_skcipher *tfm)
 
 	return ctx->cipher;
 }
-struct skcipher_instance *
-skcipher_alloc_instance_simple(struct crypto_template *tmpl, struct rtattr **tb,
-			       struct crypto_alg **cipher_alg_ret);
+
+struct skcipher_instance *skcipher_alloc_instance_simple(
+	struct crypto_template *tmpl, struct rtattr **tb);
+
+static inline struct crypto_alg *skcipher_ialg_simple(
+	struct skcipher_instance *inst)
+{
+	struct crypto_spawn *spawn = skcipher_instance_ctx(inst);
+
+	return spawn->alg;
+}
 
 #endif	/* _CRYPTO_INTERNAL_SKCIPHER_H */
 
-- 
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

^ permalink raw reply related	[flat|nested] 5+ messages in thread
end of thread, other threads:[~2019-12-20  5:29 UTC | newest]

Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-12-06  5:57 [PATCH] crypto: skcipher - Add skcipher_ialg_simple helper Herbert Xu
2019-12-06 21:47 ` Eric Biggers
2019-12-18  8:07 ` [v2 PATCH] " Herbert Xu
2019-12-19 20:34   ` Eric Biggers
2019-12-20  5:29     ` [v3 " Herbert Xu

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