LWIP - fixed TCP panic when shutting down

- listening sockets do not handle some callbacks

diff --git a/servers/lwip/tcp.c b/servers/lwip/tcp.c
index 077b964df0318cd5d77defc38f59e9765967a55d..086484f0ad8e6ca30dbd57a1a72d0c9f70de43da 100644 (file)
--- a/servers/lwip/tcp.c
+++ b/servers/lwip/tcp.c
@@ -156,10 +156,12 @@ static void tcp_op_close(struct socket * sock, __unused message * m)
                int err;
 
                /* we are not able to handle any callback anymore */
-               tcp_arg((struct tcp_pcb *)sock->pcb, NULL);
-               tcp_err((struct tcp_pcb *)sock->pcb, NULL);
-               tcp_sent((struct tcp_pcb *)sock->pcb, NULL);
-               tcp_recv((struct tcp_pcb *)sock->pcb, NULL);
+               if (((struct tcp_pcb *)sock->pcb)->state != LISTEN) {
+                       tcp_arg((struct tcp_pcb *)sock->pcb, NULL);
+                       tcp_err((struct tcp_pcb *)sock->pcb, NULL);
+                       tcp_sent((struct tcp_pcb *)sock->pcb, NULL);
+                       tcp_recv((struct tcp_pcb *)sock->pcb, NULL);
+               }
 
                err = tcp_close(sock->pcb);
                assert(err == ERR_OK);