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crypto: Unlink and free instances when deleted

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We leak the crypto instance when we unregister an instance with
crypto_del_alg(). Therefore we introduce crypto_unregister_instance()
to unlink the crypto instance from the template's instances list and
to free the recources of the instance properly.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Steffen Klassert 2011-11-08 10:09:17 +01:00 committed by Herbert Xu
parent 505172e11f
commit ce3fd840f5
3 changed files with 31 additions and 1 deletions
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29
crypto/algapi.c
View File

@ -518,6 +518,35 @@ int crypto_register_instance(struct crypto_template *tmpl,
}
EXPORT_SYMBOL_GPL(crypto_register_instance);
int crypto_unregister_instance(struct crypto_alg *alg)
{
int err;
struct crypto_instance *inst = (void *)alg;
struct crypto_template *tmpl = inst->tmpl;
LIST_HEAD(users);
if (!(alg->cra_flags & CRYPTO_ALG_INSTANCE))
return -EINVAL;
BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
down_write(&crypto_alg_sem);
hlist_del_init(&inst->list);
err = crypto_remove_alg(alg, &users);
up_write(&crypto_alg_sem);
if (err)
return err;
tmpl->free(inst);
crypto_remove_final(&users);
return 0;
}
EXPORT_SYMBOL_GPL(crypto_unregister_instance);
int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
struct crypto_instance *inst, u32 mask)
{

2
crypto/crypto_user.c
View File

@ -301,7 +301,7 @@ static int crypto_del_alg(struct sk_buff *skb, struct nlmsghdr *nlh,
if (atomic_read(&alg->cra_refcnt) != 1)
return -EBUSY;
return crypto_unregister_alg(alg);
return crypto_unregister_instance(alg);
}
static int crypto_add_alg(struct sk_buff *skb, struct nlmsghdr *nlh,

1
include/crypto/algapi.h
View File

@ -134,6 +134,7 @@ struct crypto_template *crypto_lookup_template(const char *name);
int crypto_register_instance(struct crypto_template *tmpl,
struct crypto_instance *inst);
int crypto_unregister_instance(struct crypto_alg *alg);
int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
struct crypto_instance *inst, u32 mask);