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-rw-r--r--pkg/tcpip/transport/tcp/snd.go6
1 files changed, 4 insertions, 2 deletions
diff --git a/pkg/tcpip/transport/tcp/snd.go b/pkg/tcpip/transport/tcp/snd.go
index 6c363a929..95bea4d88 100644
--- a/pkg/tcpip/transport/tcp/snd.go
+++ b/pkg/tcpip/transport/tcp/snd.go
@@ -342,15 +342,17 @@ func (s *sender) sendData() {
s.ep.mu.Lock()
// We're sending a FIN by default
fl := flagFin
+ segEnd = seg.sequenceNumber
if (s.ep.shutdownFlags&tcpip.ShutdownRead) != 0 && rcvBufUsed > 0 {
// If there is unread data we must send a RST.
// For more information see RFC 2525 section 2.17.
fl = flagRst
+ } else {
+ segEnd = seg.sequenceNumber.Add(1)
}
+
s.ep.mu.Unlock()
seg.flags |= uint8(fl)
-
- segEnd = seg.sequenceNumber.Add(1)
} else {
// We're sending a non-FIN segment.
if !seg.sequenceNumber.LessThan(end) {