diff --git a/net/core/scm.c b/net/core/scm.c
index 5c356f0dee30..acb7d776fa6e 100644
--- a/net/core/scm.c
+++ b/net/core/scm.c
@@ -229,6 +229,8 @@ int put_cmsg(struct msghdr * msg, int level, int type, int len, void *data)
 	if (msg->msg_control_is_user) {
 		struct cmsghdr __user *cm = msg->msg_control_user;
 
+		check_object_size(data, cmlen - sizeof(*cm), true);
+
 		if (!user_write_access_begin(cm, cmlen))
 			goto efault;