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authorSteffen Klassert <steffen.klassert@secunet.com>2011-11-08 10:09:17 +0100
committerHerbert Xu <herbert@gondor.apana.org.au>2011-11-09 12:04:06 +0800
commitce3fd840f588d85a8c1be651cf90fa1ba1f029e9 (patch)
treed113057ca46784cfa34380ab44f73dde76bda1fd /crypto/algapi.c
parent505172e11f5a0d9916e20e40d3b0a6f87d3a59b6 (diff)
downloadlinux-ce3fd840f588d85a8c1be651cf90fa1ba1f029e9.tar.gz
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>
Diffstat (limited to 'crypto/algapi.c')
-rw-r--r--crypto/algapi.c29
1 files changed, 29 insertions, 0 deletions
diff --git a/crypto/algapi.c b/crypto/algapi.c
index 54dd4e33b5d..9d4a9fe913f 100644
--- 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)
{