From 2ba2846ced48f8549e3afe5d528ad618e64df9d3 Mon Sep 17 00:00:00 2001
From: GAEHWILER Reto <reto.gaehwiler@hexagon.com>
Date: Tue, 3 Mar 2020 09:15:18 -0600
Subject: [PATCH] net/tcp/tcp_input.c:  Fix of faulty TCP sequence increments

Sequence numbers must not be incremented in the case of retransmitted packets
---
 net/tcp/tcp_input.c | 11 +----------
 1 file changed, 1 insertion(+), 10 deletions(-)

diff --git a/net/tcp/tcp_input.c b/net/tcp/tcp_input.c
index 1b86e7dfbc..3daf251293 100644
--- a/net/tcp/tcp_input.c
+++ b/net/tcp/tcp_input.c
@@ -430,16 +430,7 @@ found:
 
       if (ackseq < rcvseq)
         {
-          if (dev->d_len > 0)
-            {
-              /* Increment the received sequence number (perhaps including the
-               * discarded dummy byte in the probe).
-               */
-
-              net_incr32(conn->rcvseq, dev->d_len);
-            }
-
-          /* And send a "normal" acknowledgment of the KeepAlive probe */
+          /* Send a "normal" acknowledgment of the KeepAlive probe */
 
           tcp_send(dev, conn, TCP_ACK, tcpiplen);
           return;