Commit 38cb2419 authored Nov 17, 2007 by Herbert Xu

[CRYPTO] api: Fix potential race in crypto_remove_spawn



As it is crypto_remove_spawn may try to unregister an instance which is
yet to be registered.  This patch fixes this by checking whether the
instance has been registered before attempting to remove it.

It also removes a bogus cra_destroy check in crypto_register_instance as
1) it's outside the mutex;
2) we have a check in __crypto_register_alg already.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

parent f347c4fa

crypto/algapi.c

+3 −3

Original line number	Diff line number	Diff line
		@@ -95,6 +95,9 @@ static void crypto_remove_spawn(struct crypto_spawn *spawn,
		return;

		inst->alg.cra_flags \|= CRYPTO_ALG_DEAD;
		if (hlist_unhashed(&inst->list))
		return;

		if (!tmpl \|\| !crypto_tmpl_get(tmpl))
		return;

		@@ -335,9 +338,6 @@ int crypto_register_instance(struct crypto_template *tmpl,
		LIST_HEAD(list);
		int err = -EINVAL;

		if (inst->alg.cra_destroy)
		goto err;

		err = crypto_check_alg(&inst->alg);
		if (err)
		goto err;