diff --git a/include/uapi/linux/tcp.h b/include/uapi/linux/tcp.h
index 42fc5a640df4..8fc09e8638b3 100644
--- a/include/uapi/linux/tcp.h
+++ b/include/uapi/linux/tcp.h
@@ -357,6 +357,6 @@ struct tcp_zerocopy_receive {
 	__u64 msg_control; /* ancillary data */
 	__u64 msg_controllen;
 	__u32 msg_flags;
-	/* __u32 hole;  Next we must add >1 u32 otherwise length checks fail. */
+	__u32 reserved; /* set to 0 for now */
 };
 #endif /* _UAPI_LINUX_TCP_H */
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index e1a17c6b473c..9896ca10bb34 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -2030,6 +2030,7 @@ static int tcp_zerocopy_vm_insert_batch(struct vm_area_struct *vma,
 		err);
 }
 
+#define TCP_VALID_ZC_MSG_FLAGS   (TCP_CMSG_TS)
 static void tcp_recv_timestamp(struct msghdr *msg, const struct sock *sk,
 			       struct scm_timestamping_internal *tss);
 static void tcp_zc_finalize_rx_tstamp(struct sock *sk,
@@ -4152,13 +4153,21 @@ static int do_tcp_getsockopt(struct sock *sk, int level,
 			return -EFAULT;
 		if (len < offsetofend(struct tcp_zerocopy_receive, length))
 			return -EINVAL;
-		if (len > sizeof(zc)) {
+		if (unlikely(len > sizeof(zc))) {
+			err = check_zeroed_user(optval + sizeof(zc),
+						len - sizeof(zc));
+			if (err < 1)
+				return err == 0 ? -EINVAL : err;
 			len = sizeof(zc);
 			if (put_user(len, optlen))
 				return -EFAULT;
 		}
 		if (copy_from_user(&zc, optval, len))
 			return -EFAULT;
+		if (zc.reserved)
+			return -EINVAL;
+		if (zc.msg_flags &  ~(TCP_VALID_ZC_MSG_FLAGS))
+			return -EINVAL;
 		lock_sock(sk);
 		err = tcp_zerocopy_receive(sk, &zc, &tss);
 		release_sock(sk);