diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 9eeab82..35eb8de 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -2654,7 +2654,7 @@
 	struct file_security_struct *fsec;
 
 	/* struct fown_struct is never outside the context of a struct file */
-        file = (struct file *)((long)fown - offsetof(struct file,f_owner));
+        file = container_of(fown, struct file, f_owner);
 
 	tsec = tsk->security;
 	fsec = file->f_security;