keys: Invalidate used request_key authentication keys

Invalidate used request_key authentication keys rather than revoking them
so that they get cleaned up immediately rather than potentially hanging
around.  There doesn't seem any need to keep the revoked keys around.

Signed-off-by: David Howells <dhowells@redhat.com>

security/keys/key.c

@@ -459,7 +459,7 @@ static int __key_instantiate_and_link(struct key *key,
 
 			/* disable the authorisation key */
 			if (authkey)
-				key_revoke(authkey);
+				key_invalidate(authkey);
 
 			if (prep->expiry != TIME64_MAX) {
 				key->expiry = prep->expiry;
@@ -616,7 +616,7 @@ int key_reject_and_link(struct key *key,
 
 		/* disable the authorisation key */
 		if (authkey)
-			key_revoke(authkey);
+			key_invalidate(authkey);
 	}
 
 	mutex_unlock(&key_construction_mutex);

security/keys/request_key.c

@@ -222,7 +222,7 @@ static int construct_key(struct key *key, const void *callout_info,
 	/* check that the actor called complete_request_key() prior to
 	 * returning an error */
 	WARN_ON(ret < 0 &&
-		!test_bit(KEY_FLAG_REVOKED, &authkey->flags));
+		!test_bit(KEY_FLAG_INVALIDATED, &authkey->flags));
 
 	key_put(authkey);
 	kleave(" = %d", ret);