extmod/modlwip: Handle case of accept callback called with null PCB.
@@ -429,6 +429,11 @@ STATIC err_t _lwip_tcp_accept_finished(void *arg, struct tcp_pcb *pcb)
// Callback for incoming tcp connections.
STATIC err_t _lwip_tcp_accept(void *arg, struct tcp_pcb *newpcb, err_t err) {
+ // err can be ERR_MEM to notify us that there was no memory for an incoming connection
+ if (err != ERR_OK) {
+ return ERR_OK;
+ }
+
lwip_socket_obj_t *socket = (lwip_socket_obj_t*)arg;
tcp_recv(newpcb, _lwip_tcp_recv_unaccepted);
