diff options
| author | Eric Dumazet <edumazet@google.com> | 2017-12-11 04:55:02 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-06-26 03:08:06 +0300 |
| commit | 4e43b6a8b40fcb4a1773857f4610796cf4aa207c (patch) | |
| tree | bc9610cd8a17198684cad2303d8f098266eb9691 /net/ipv4 | |
| parent | 1fab25ce8db367f0d6a22baba96bbe49e68ba5c7 (diff) | |
| download | linux-4e43b6a8b40fcb4a1773857f4610796cf4aa207c.tar.xz | |
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/ipv4')
| -rw-r--r-- | net/ipv4/tcp_input.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index 94a55b83e48c..8999e25fd0e1 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -636,7 +636,7 @@ 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; |