WPS: Fix clearing of SetSelectedRegistrar with multiple interfaces

The SetSelectedRegistrar timeout was registered for each registrar
instance, but the only context pointer (struct subscription *) was
shared with each registrar which resulted in the timeout getting
cancelled for some of the registrar instances before the selected
registrar (ER) information was cleared.

In addition, when an ER unsubscribed from receiving events, the
selected registrar information got cleared only from a single
registrar.

Fix these issues by registering a pointer to the registrar
instance in the timeout and by iterating over all UPnP interfaces
when removing a subscription.

Signed-hostap: Jouni Malinen <jouni@qca.qualcomm.com>

src/wps/wps_upnp.c

@@ -550,10 +550,13 @@ static void upnp_wps_device_send_event(struct upnp_wps_device_sm *sm)
  */
 void subscription_destroy(struct subscription *s)
 {
+	struct upnp_wps_device_interface *iface;
 	wpa_printf(MSG_DEBUG, "WPS UPnP: Destroy subscription %p", s);
 	subscr_addr_free_all(s);
 	event_delete_all(s);
-	upnp_er_remove_notification(s);
+	dl_list_for_each(iface, &s->sm->interfaces,
+			 struct upnp_wps_device_interface, list)
+		upnp_er_remove_notification(iface->wps->registrar, s);
 	os_free(s);
 }
 

src/wps/wps_upnp_ap.c

@@ -19,9 +19,10 @@
 static void upnp_er_set_selected_timeout(void *eloop_ctx, void *timeout_ctx)
 {
 	struct subscription *s = eloop_ctx;
+	struct wps_registrar *reg = timeout_ctx;
 	wpa_printf(MSG_DEBUG, "WPS: SetSelectedRegistrar from ER timed out");
 	s->selected_registrar = 0;
-	wps_registrar_selected_registrar_changed(s->reg);
+	wps_registrar_selected_registrar_changed(reg);
 }
 
 
@@ -40,7 +41,7 @@ int upnp_er_set_selected_registrar(struct wps_registrar *reg,
 		return -1;
 
 	s->reg = reg;
-	eloop_cancel_timeout(upnp_er_set_selected_timeout, s, NULL);
+	eloop_cancel_timeout(upnp_er_set_selected_timeout, s, reg);
 
 	os_memset(s->authorized_macs, 0, sizeof(s->authorized_macs));
 	if (attr.selected_registrar == NULL || *attr.selected_registrar == 0) {
@@ -67,7 +68,7 @@ int upnp_er_set_selected_registrar(struct wps_registrar *reg,
 #endif /* CONFIG_WPS2 */
 		}
 		eloop_register_timeout(WPS_PBC_WALK_TIME, 0,
-				       upnp_er_set_selected_timeout, s, NULL);
+				       upnp_er_set_selected_timeout, s, reg);
 	}
 
 	wps_registrar_selected_registrar_changed(reg);
@@ -76,10 +77,11 @@ int upnp_er_set_selected_registrar(struct wps_registrar *reg,
 }
 
 
-void upnp_er_remove_notification(struct subscription *s)
+void upnp_er_remove_notification(struct wps_registrar *reg,
+				 struct subscription *s)
 {
 	s->selected_registrar = 0;
-	eloop_cancel_timeout(upnp_er_set_selected_timeout, s, NULL);
-	if (s->reg)
-		wps_registrar_selected_registrar_changed(s->reg);
+	eloop_cancel_timeout(upnp_er_set_selected_timeout, s, reg);
+	if (reg)
+		wps_registrar_selected_registrar_changed(reg);
 }

src/wps/wps_upnp_i.h

@@ -188,6 +188,7 @@ void event_send_stop_all(struct upnp_wps_device_sm *sm);
 int upnp_er_set_selected_registrar(struct wps_registrar *reg,
 				   struct subscription *s,
 				   const struct wpabuf *msg);
-void upnp_er_remove_notification(struct subscription *s);
+void upnp_er_remove_notification(struct wps_registrar *reg,
+				 struct subscription *s);
 
 #endif /* WPS_UPNP_I_H */