Patch "tcp: refresh tp timestamp before tcp_mtu_probe()" has been added to the 4.13-stable tree

Patch "tcp: refresh tp timestamp before tcp_mtu_probe()" has been added to the 4.13-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    tcp: refresh tp timestamp before tcp_mtu_probe()

to the 4.13-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     tcp-refresh-tp-timestamp-before-tcp_mtu_probe.patch
and it can be found in the queue-4.13 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Wed Nov 15 17:25:34 CET 2017
From: Eric Dumazet <edumazet@google.com>
Date: Thu, 26 Oct 2017 21:21:40 -0700
Subject: tcp: refresh tp timestamp before tcp_mtu_probe()

From: Eric Dumazet <edumazet@google.com>


[ Upstream commit ee1836aec4f5a977c1699a311db4d9027ef21ac8 ]

In the unlikely event tcp_mtu_probe() is sending a packet, we
want tp->tcp_mstamp being as accurate as possible.

This means we need to call tcp_mstamp_refresh() a bit earlier in
tcp_write_xmit().

Fixes: 385e20706fac ("tcp: use tp->tcp_mstamp in output path")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/ipv4/tcp_output.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -2271,6 +2271,7 @@ static bool tcp_write_xmit(struct sock *
 
 	sent_pkts = 0;
 
+	tcp_mstamp_refresh(tp);
 	if (!push_one) {
 		/* Do MTU probing. */
 		result = tcp_mtu_probe(sk);
@@ -2282,7 +2283,6 @@ static bool tcp_write_xmit(struct sock *
 	}
 
 	max_segs = tcp_tso_segs(sk, mss_now);
-	tcp_mstamp_refresh(tp);
 	while ((skb = tcp_send_head(sk))) {
 		unsigned int limit;
 


Patches currently in stable-queue which might be from edumazet@google.com are

queue-4.13/tcp-refresh-tp-timestamp-before-tcp_mtu_probe.patch
queue-4.13/net-call-cgroup_sk_alloc-earlier-in-sk_clone_lock.patch
queue-4.13/tcp-dccp-fix-ireq-opt-races.patch
queue-4.13/tcp-fix-tcp_mtu_probe-vs-highest_sack.patch
queue-4.13/ipv6-addrconf-increment-ifp-refcount-before-ipv6_del_addr.patch
queue-4.13/ipv6-flowlabel-do-not-leave-opt-tot_len-with-garbage.patch
queue-4.13/packet-avoid-panic-in-packet_getsockopt.patch
queue-4.13/sctp-add-the-missing-sock_owned_by_user-check-in-sctp_icmp_redirect.patch
queue-4.13/net_sched-avoid-matching-qdisc-with-zero-handle.patch
queue-4.13/tun-tap-sanitize-tunsetsndbuf-input.patch
queue-4.13/tcp-dccp-fix-lockdep-splat-in-inet_csk_route_req.patch
queue-4.13/tcp-dccp-fix-other-lockdep-splats-accessing-ireq_opt.patch