KEYS: Fix an RCU warning in the reading of user keys

[deliverable/linux.git] / security / keys / user_defined.c

diff --git a/security/keys/user_defined.c b/security/keys/user_defined.c
index 7c687d568221cd71a3e863b9c9c50f5cd9352005..e9aa079296561507835e0e349a55f07b11bec5bb 100644 (file)
--- a/security/keys/user_defined.c
+++ b/security/keys/user_defined.c
@@ -199,7 +199,8 @@ long user_read(const struct key *key, char __user *buffer, size_t buflen)
        struct user_key_payload *upayload;
        long ret;
 
-       upayload = rcu_dereference(key->payload.data);
+       upayload = rcu_dereference_protected(
+               key->payload.data, rwsem_is_locked(&((struct key *)key)->sem));
        ret = upayload->datalen;
 
        /* we can return the data as is */