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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 <edumazet@google.com> Acked-by: Soheil Hassas Yeganeh <soheil@google.com> Acked-by: Wei Wang <weiwan@google.com> Acked-by: Neal Cardwell <ncardwell@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -631,7 +631,7 @@ void tcp_rcv_space_adjust(struct sock *sk)
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sk->sk_rcvbuf = rcvbuf;
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/* Make the window clamp follow along. */
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tp->window_clamp = rcvwin;
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tp->window_clamp = tcp_win_from_space(sk, rcvbuf);
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}
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}
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tp->rcvq_space.space = copied;
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