---

yaml
---
r: 213909
b: refs/heads/master
c: e88c64f
h: refs/heads/master
i:
  213907: 6c2a76b
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: c2368e795cec561229ef66a04ac51629b918a9e8
+refs/heads/master: e88c64f0a42575e01c7ace903d0570bc0b7fcf85

trunk/net/ipv4/tcp_output.c

@@ -2429,6 +2429,12 @@ struct sk_buff *tcp_make_synack(struct sock *sk, struct dst_entry *dst,
 		__u8 rcv_wscale;
 		/* Set this up on the first call only */
 		req->window_clamp = tp->window_clamp ? : dst_metric(dst, RTAX_WINDOW);
+
+		/* limit the window selection if the user enforce a smaller rx buffer */
+		if (sk->sk_userlocks & SOCK_RCVBUF_LOCK &&
+		    (req->window_clamp > tcp_full_space(sk) || req->window_clamp == 0))
+			req->window_clamp = tcp_full_space(sk);
+
 		/* tcp_full_space because it is guaranteed to be the first packet */
 		tcp_select_initial_window(tcp_full_space(sk),
 			mss - (ireq->tstamp_ok ? TCPOLEN_TSTAMP_ALIGNED : 0),
@@ -2555,6 +2561,11 @@ static void tcp_connect_init(struct sock *sk)
 
 	tcp_initialize_rcv_mss(sk);
 
+	/* limit the window selection if the user enforce a smaller rx buffer */
+	if (sk->sk_userlocks & SOCK_RCVBUF_LOCK &&
+	    (tp->window_clamp > tcp_full_space(sk) || tp->window_clamp == 0))
+		tp->window_clamp = tcp_full_space(sk);
+
 	tcp_select_initial_window(tcp_full_space(sk),
 				  tp->advmss - (tp->rx_opt.ts_recent_stamp ? tp->tcp_header_len - sizeof(struct tcphdr) : 0),
 				  &tp->rcv_wnd,