KEYS: refcount bug fix

This patch fixes the key_ref leak, removes the unnecessary KEY_FLAG_KEEP
test before setting the flag, and cleans up the if/then brackets style
introduced in commit:
d3600bc KEYS: prevent keys from being removed from specified keyrings

Reported-by: David Howells <dhowells@redhat.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Acked-by: David Howells <dhowells@redhat.com>

security/keys/key.c

@@ -430,8 +430,7 @@ static int __key_instantiate_and_link(struct key *key,
 
 			/* and link it into the destination keyring */
 			if (keyring) {
-				if (test_bit(KEY_FLAG_KEEP, &keyring->flags))
-					set_bit(KEY_FLAG_KEEP, &key->flags);
+				set_bit(KEY_FLAG_KEEP, &key->flags);
 
 				__key_link(key, _edit);
 			}

security/keys/keyctl.c

@@ -381,12 +381,11 @@ long keyctl_revoke_key(key_serial_t id)
 	}
 
 	key = key_ref_to_ptr(key_ref);
+	ret = 0;
 	if (test_bit(KEY_FLAG_KEEP, &key->flags))
-		return -EPERM;
-	else {
+		ret = -EPERM;
+	else
 		key_revoke(key);
-		ret = 0;
-	}
 
 	key_ref_put(key_ref);
 error:
@@ -432,12 +431,11 @@ long keyctl_invalidate_key(key_serial_t id)
 
 invalidate:
 	key = key_ref_to_ptr(key_ref);
+	ret = 0;
 	if (test_bit(KEY_FLAG_KEEP, &key->flags))
 		ret = -EPERM;
-	else {
+	else
 		key_invalidate(key);
-		ret = 0;
-	}
 error_put:
 	key_ref_put(key_ref);
 error:
@@ -1352,12 +1350,11 @@ long keyctl_set_timeout(key_serial_t id, unsigned timeout)
 
 okay:
 	key = key_ref_to_ptr(key_ref);
+	ret = 0;
 	if (test_bit(KEY_FLAG_KEEP, &key->flags))
 		ret = -EPERM;
-	else {
+	else
 		key_set_timeout(key, timeout);
-		ret = 0;
-	}
 	key_put(key);
 
 error: