crypto: geniv - simply error handling in aead_geniv_alloc()

Simplify the error handling in aead_geniv_alloc() 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>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/crypto/geniv.c b/crypto/geniv.c
index dbcc640..6a90c52 100644 (file)
--- a/crypto/geniv.c
+++ b/crypto/geniv.c
@@ -41,7 +41,6 @@ static void aead_geniv_free(struct aead_instance *inst)
 struct aead_instance *aead_geniv_alloc(struct crypto_template *tmpl,
                                       struct rtattr **tb, u32 type, u32 mask)
 {
-       const char *name;
        struct crypto_aead_spawn *spawn;
        struct crypto_attr_type *algt;
        struct aead_instance *inst;
@@ -57,10 +56,6 @@ struct aead_instance *aead_geniv_alloc(struct crypto_template *tmpl,
        if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
                return ERR_PTR(-EINVAL);
 
-       name = crypto_attr_alg_name(tb[1]);
-       if (IS_ERR(name))
-               return ERR_CAST(name);
-
        inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
        if (!inst)
                return ERR_PTR(-ENOMEM);
@@ -71,7 +66,7 @@ struct aead_instance *aead_geniv_alloc(struct crypto_template *tmpl,
        mask |= crypto_requires_sync(algt->type, algt->mask);
 
        err = crypto_grab_aead(spawn, aead_crypto_instance(inst),
-                              name, type, mask);
+                              crypto_attr_alg_name(tb[1]), type, mask);
        if (err)
                goto err_free_inst;
 
@@ -82,17 +77,17 @@ struct aead_instance *aead_geniv_alloc(struct crypto_template *tmpl,
 
        err = -EINVAL;
        if (ivsize < sizeof(u64))
-               goto err_drop_alg;
+               goto err_free_inst;
 
        err = -ENAMETOOLONG;
        if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
                     "%s(%s)", tmpl->name, alg->base.cra_name) >=
            CRYPTO_MAX_ALG_NAME)
-               goto err_drop_alg;
+               goto err_free_inst;
        if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
                     "%s(%s)", tmpl->name, alg->base.cra_driver_name) >=
            CRYPTO_MAX_ALG_NAME)
-               goto err_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;
@@ -111,10 +106,8 @@ struct aead_instance *aead_geniv_alloc(struct crypto_template *tmpl,
 out:
        return inst;
 
-err_drop_alg:
-       crypto_drop_aead(spawn);
 err_free_inst:
-       kfree(inst);
+       aead_geniv_free(inst);
        inst = ERR_PTR(err);
        goto out;
 }