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authorEric Dumazet <edumazet@google.com>2017-12-10 17:55:02 -0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-07-03 11:21:24 +0200
commit4dff97920e13af3e92180eefa6b7712d4eac5e58 (patch)
tree10a8cfe4a17a5716df56816094efb17bf65625a6 /net
parent2cb1b6033d10b2c613f79da40da9777a033ad85f (diff)
tcp: do not overshoot window_clamp in tcp_rcv_space_adjust()
commit 02db55718d53f9d426cee504c27fb768e9ed4ffe upstream. 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> Cc: Benjamin Gilbert <benjamin.gilbert@coreos.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
-rw-r--r--net/ipv4/tcp_input.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 23b95aead897..a9041915afc0 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -612,7 +612,7 @@ 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(rcvbuf);
}
}
tp->rcvq_space.space = copied;