From 02db55718d53f9d426cee504c27fb768e9ed4ffe Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Sun, 10 Dec 2017 17:55:02 -0800 Subject: tcp: do not overshoot window_clamp in tcp_rcv_space_adjust() While rcvbuf is properly clamped by tcp_rmem[2], rcvwin is left to a potentially too big value. It has no serious effect, since : 1) tcp_grow_window() has very strict checks. 2) window_clamp can be mangled by user space to any value anyway. tcp_init_buffer_space() and companions use tcp_full_space(), we use tcp_win_from_space() to avoid reloading sk->sk_rcvbuf Signed-off-by: Eric Dumazet Acked-by: Soheil Hassas Yeganeh Acked-by: Wei Wang Acked-by: Neal Cardwell Signed-off-by: David S. Miller --- net/ipv4/tcp_input.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'net/ipv4/tcp_input.c') diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 9550cc42de2d..746a6773c482 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -631,7 +631,7 @@ void tcp_rcv_space_adjust(struct sock *sk) sk->sk_rcvbuf = rcvbuf; /* Make the window clamp follow along. */ - tp->window_clamp = rcvwin; + tp->window_clamp = tcp_win_from_space(sk, rcvbuf); } } tp->rcvq_space.space = copied; -- cgit