[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>
diff --git a/crypto/algapi.c b/crypto/algapi.c
index 8ff8c26..8383282 100644
--- a/crypto/algapi.c
+++ b/crypto/algapi.c
@@ -95,6 +95,9 @@
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 @@
LIST_HEAD(list);
int err = -EINVAL;
- if (inst->alg.cra_destroy)
- goto err;
-
err = crypto_check_alg(&inst->alg);
if (err)
goto err;