[lwip-members] [bug #44399] receiving TCP Ack packet with Window Update

[Joel Cunningham]

Follow-up Comment #1, bug #44399 (project lwip):

>From tcp_receive():

/* Update window. */
if (TCP_SEQ_LT(pcb->snd_wl1, seqno) ||
   (pcb->snd_wl1 == seqno && TCP_SEQ_LT(pcb->snd_wl2, ackno)) ||
   (pcb->snd_wl2 == ackno && tcphdr->wnd > pcb->snd_wnd)) {
  pcb->snd_wnd = SND_WND_SCALE(pcb, tcphdr->wnd); 
  ...
}

The third OR clause should capture the case you're describing.  send_wl1 and
send_wl2 are the SEQ and ACK from the last ACK packet that updated the window.
 So if we receive a pure window update where SEQ and ACK are unchanged from
the last packet that updated the window, then the window sizes are compared

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