[lwip-devel] [bug #19162] lwip_sendto: possible to corrupt remote addr/port connection state

[Bryan Schwichtenberg]

Follow-up Comment #4, bug #19162 (project lwip):

Hello,
  Sorry for the confusion. When I said one thread I was referring to on
"application" thread outside of lwIP.  There is still the receive thread
running inside lwIP. So I believe the problem is similar.  As I look at the
lwip_sendto() function there is a lwip_send() (which evently puts and event
into conn-mbox) followed by a netconn_disconnect() (which also posts to
conn->mbox).  In our case the server on the other side responds to the
lwip_send() before the netconn_disconnect() is executed. The result is that
lwIP sends an ICMP packet to the server saying detination unreachable.
Essentially stopping the file transfer.

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