crypto: aead - pass instance to crypto_grab_aead()

Initializing a crypto_aead_spawn currently requires:

1. Set spawn->base.inst to point to the instance.
2. Call crypto_grab_aead().

But there's no reason for these steps to be separate, and in fact this
unneeded complication has caused at least one bug, the one fixed by
commit 6db43410 ("crypto: adiantum - initialize crypto_spawn::inst")

So just make crypto_grab_aead() take the instance as an argument.

To keep the function calls from getting too unwieldy due to this extra
argument, also introduce a 'mask' variable into the affected places
which weren't already using one.
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

crypto/aead.c

@@ -207,9 +207,11 @@ static const struct crypto_type crypto_aead_type = {
 	.tfmsize = offsetof(struct crypto_aead, base),
 };
 
-int crypto_grab_aead(struct crypto_aead_spawn *spawn, const char *name,
-		     u32 type, u32 mask)
+int crypto_grab_aead(struct crypto_aead_spawn *spawn,
+		     struct crypto_instance *inst,
+		     const char *name, u32 type, u32 mask)
 {
+	spawn->base.inst = inst;
 	spawn->base.frontend = &crypto_aead_type;
 	return crypto_grab_spawn(&spawn->base, name, type, mask);
 }

crypto/ccm.c

@@ -734,6 +734,7 @@ static int crypto_rfc4309_create(struct crypto_template *tmpl,
 				 struct rtattr **tb)
 {
 	struct crypto_attr_type *algt;
+	u32 mask;
 	struct aead_instance *inst;
 	struct crypto_aead_spawn *spawn;
 	struct aead_alg *alg;
@@ -747,6 +748,8 @@ static int crypto_rfc4309_create(struct crypto_template *tmpl,
 	if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
 		return -EINVAL;
 
+	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);
@@ -756,9 +759,8 @@ static int crypto_rfc4309_create(struct crypto_template *tmpl,
 		return -ENOMEM;
 
 	spawn = aead_instance_ctx(inst);
-	crypto_set_aead_spawn(spawn, aead_crypto_instance(inst));
-	err = crypto_grab_aead(spawn, ccm_name, 0,
-			       crypto_requires_sync(algt->type, algt->mask));
+	err = crypto_grab_aead(spawn, aead_crypto_instance(inst),
+			       ccm_name, 0, mask);
 	if (err)
 		goto out_free_inst;
 

crypto/cryptd.c

@@ -865,8 +865,8 @@ static int cryptd_create_aead(struct crypto_template *tmpl,
 	ctx = aead_instance_ctx(inst);
 	ctx->queue = queue;
 
-	crypto_set_aead_spawn(&ctx->aead_spawn, aead_crypto_instance(inst));
-	err = crypto_grab_aead(&ctx->aead_spawn, name, type, mask);
+	err = crypto_grab_aead(&ctx->aead_spawn, aead_crypto_instance(inst),
+			       name, type, mask);
 	if (err)
 		goto out_free_inst;
 

crypto/essiv.c

@@ -500,8 +500,7 @@ static int essiv_create(struct crypto_template *tmpl, struct rtattr **tb)
 		ictx = crypto_instance_ctx(inst);
 
 		/* AEAD cipher, e.g., "authenc(hmac(sha256),cbc(aes))" */
-		crypto_set_aead_spawn(&ictx->u.aead_spawn, inst);
-		err = crypto_grab_aead(&ictx->u.aead_spawn,
+		err = crypto_grab_aead(&ictx->u.aead_spawn, inst,
 				       inner_cipher_name, 0, mask);
 		if (err)
 			goto out_free_inst;

crypto/gcm.c

@@ -856,6 +856,7 @@ static int crypto_rfc4106_create(struct crypto_template *tmpl,
 				 struct rtattr **tb)
 {
 	struct crypto_attr_type *algt;
+	u32 mask;
 	struct aead_instance *inst;
 	struct crypto_aead_spawn *spawn;
 	struct aead_alg *alg;
@@ -869,6 +870,8 @@ static int crypto_rfc4106_create(struct crypto_template *tmpl,
 	if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
 		return -EINVAL;
 
+	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);
@@ -878,9 +881,8 @@ static int crypto_rfc4106_create(struct crypto_template *tmpl,
 		return -ENOMEM;
 
 	spawn = aead_instance_ctx(inst);
-	crypto_set_aead_spawn(spawn, aead_crypto_instance(inst));
-	err = crypto_grab_aead(spawn, ccm_name, 0,
-			       crypto_requires_sync(algt->type, algt->mask));
+	err = crypto_grab_aead(spawn, aead_crypto_instance(inst),
+			       ccm_name, 0, mask);
 	if (err)
 		goto out_free_inst;
 
@@ -1087,6 +1089,7 @@ static int crypto_rfc4543_create(struct crypto_template *tmpl,
 				struct rtattr **tb)
 {
 	struct crypto_attr_type *algt;
+	u32 mask;
 	struct aead_instance *inst;
 	struct crypto_aead_spawn *spawn;
 	struct aead_alg *alg;
@@ -1101,6 +1104,8 @@ static int crypto_rfc4543_create(struct crypto_template *tmpl,
 	if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
 		return -EINVAL;
 
+	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);
@@ -1111,9 +1116,8 @@ static int crypto_rfc4543_create(struct crypto_template *tmpl,
 
 	ctx = aead_instance_ctx(inst);
 	spawn = &ctx->aead;
-	crypto_set_aead_spawn(spawn, aead_crypto_instance(inst));
-	err = crypto_grab_aead(spawn, ccm_name, 0,
-			       crypto_requires_sync(algt->type, algt->mask));
+	err = crypto_grab_aead(spawn, aead_crypto_instance(inst),
+			       ccm_name, 0, mask);
 	if (err)
 		goto out_free_inst;
 

crypto/geniv.c

@@ -64,8 +64,8 @@ struct aead_instance *aead_geniv_alloc(struct crypto_template *tmpl,
 	/* Ignore async algorithms if necessary. */
 	mask |= crypto_requires_sync(algt->type, algt->mask);
 
-	crypto_set_aead_spawn(spawn, aead_crypto_instance(inst));
-	err = crypto_grab_aead(spawn, name, type, mask);
+	err = crypto_grab_aead(spawn, aead_crypto_instance(inst),
+			       name, type, mask);
 	if (err)
 		goto err_free_inst;
 

crypto/pcrypt.c

@@ -258,9 +258,8 @@ static int pcrypt_create_aead(struct crypto_template *tmpl, struct rtattr **tb,
 	if (!ctx->psdec)
 		goto out_free_psenc;
 
-	crypto_set_aead_spawn(&ctx->spawn, aead_crypto_instance(inst));
-
-	err = crypto_grab_aead(&ctx->spawn, name, 0, 0);
+	err = crypto_grab_aead(&ctx->spawn, aead_crypto_instance(inst),
+			       name, 0, 0);
 	if (err)
 		goto out_free_psdec;
 

include/crypto/internal/aead.h

@@ -81,14 +81,9 @@ static inline struct aead_request *aead_request_cast(
 	return container_of(req, struct aead_request, base);
 }
 
-static inline void crypto_set_aead_spawn(
-	struct crypto_aead_spawn *spawn, struct crypto_instance *inst)
-{
-	crypto_set_spawn(&spawn->base, inst);
-}
-
-int crypto_grab_aead(struct crypto_aead_spawn *spawn, const char *name,
-		     u32 type, u32 mask);
+int crypto_grab_aead(struct crypto_aead_spawn *spawn,
+		     struct crypto_instance *inst,
+		     const char *name, u32 type, u32 mask);
 
 static inline void crypto_drop_aead(struct crypto_aead_spawn *spawn)
 {