Merge tag 'v5.0-rc3' into next-general

Sync to Linux 5.0-rc3 to pull in the VFS changes which impacted a lot
of the LSM code.

security/security.c

@@ -1472,6 +1472,13 @@ int security_cred_alloc_blank(struct cred *cred, gfp_t gfp)
 
 void security_cred_free(struct cred *cred)
 {
+	/*
+	 * There is a failure case in prepare_creds() that
+	 * may result in a call here with ->security being NULL.
+	 */
+	if (unlikely(cred->security == NULL))
+		return;
+
 	call_void_hook(cred_free, cred);
 
 	kfree(cred->security);