KEYS: Add an RCU payload dereference macro

Add an RCU payload dereference macro as this seems to be a common piece of code
amongst key types that use RCU referenced payloads.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Mimi Zohar <zohar@us.ibm.com>
Signed-off-by: James Morris <jmorris@namei.org>

1 files changed, 1 insertions, 2 deletions

diff --git a/security/keys/encrypted.c b/security/keys/encrypted.c
index 9e7e4ce3fae8..69907a58a683 100644
--- a/security/keys/encrypted.c
+++ b/security/keys/encrypted.c
@@ -765,8 +765,7 @@ static long encrypted_read(const struct key *key, char __user *buffer,
         size_t asciiblob_len;
         int ret;
 
-        epayload = rcu_dereference_protected(key->payload.data,
-                                  rwsem_is_locked(&((struct key *)key)->sem));
+        epayload = rcu_dereference_key(key);
 
         /* returns the hex encoded iv, encrypted-data, and hmac as ascii */
         asciiblob_len = epayload->datablob_len + ivsize + 1