tree d66524f7b6ed702c7939975abd53af31141599f3
parent 13cf394c8c79b5655cdc76f7ae0d9869a1434103
author Herbert Xu <herbert@gondor.apana.org.au> 1427985082 +0800
committer Herbert Xu <herbert@gondor.apana.org.au> 1428054812 +0800

crypto: api - Fix races in crypto_unregister_instance

There are multiple problems in crypto_unregister_instance:

1) The cra_refcnt BUG_ON check is racy and can cause crashes.
2) The cra_refcnt check shouldn't exist at all.
3) There is no reference on tmpl to protect the tmpl->free call.

This patch rewrites the function using crypto_remove_spawn which
now morphs into crypto_remove_instance.

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