crypto: Unlink and free instances when deleted

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>

diff --git a/crypto/algapi.c b/crypto/algapi.c
index 54dd4e3..9d4a9fe 100644 (file)
--- a/crypto/algapi.c
+++ b/crypto/algapi.c
@@ -518,6 +518,35 @@ err:
 }
 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)
 {

diff --git a/crypto/crypto_user.c b/crypto/crypto_user.c
index 2abca78..edeebe1 100644 (file)
--- a/crypto/crypto_user.c
+++ b/crypto/crypto_user.c
@@ -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,

diff --git a/include/crypto/algapi.h b/include/crypto/algapi.h
index ecc721d..418d270 100644 (file)
--- a/include/crypto/algapi.h
+++ b/include/crypto/algapi.h
@@ -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);