Flush WPS registrar state on wpa_supplicant FLUSH command

This helps hwsim test cases by avoiding undesired state from previously
executed test cases affecting following tests.

Signed-off-by: Jouni Malinen <j@w1.fi>

src/wps/wps.h

@@ -819,6 +819,7 @@ int wps_registrar_add_nfc_pw_token(struct wps_registrar *reg,
 int wps_registrar_add_nfc_password_token(struct wps_registrar *reg,
 					 const u8 *oob_dev_pw,
 					 size_t oob_dev_pw_len);
+void wps_registrar_flush(struct wps_registrar *reg);
 
 int wps_build_credential_wrap(struct wpabuf *msg,
 			      const struct wps_credential *cred);

src/wps/wps_registrar.c

@@ -676,6 +676,22 @@ wps_registrar_init(struct wps_context *wps,
 }
 
 
+void wps_registrar_flush(struct wps_registrar *reg)
+{
+	if (reg == NULL)
+		return;
+	wps_free_pins(&reg->pins);
+	wps_free_nfc_pw_tokens(&reg->nfc_pw_tokens, 0);
+	wps_free_pbc_sessions(reg->pbc_sessions);
+	reg->pbc_sessions = NULL;
+	wps_free_devices(reg->devices);
+	reg->devices = NULL;
+#ifdef WPS_WORKAROUNDS
+	reg->pbc_ignore_start.sec = 0;
+#endif /* WPS_WORKAROUNDS */
+}
+
+
 /**
  * wps_registrar_deinit - Deinitialize WPS Registrar data
  * @reg: Registrar data from wps_registrar_init()
@@ -686,11 +702,8 @@ void wps_registrar_deinit(struct wps_registrar *reg)
 		return;
 	eloop_cancel_timeout(wps_registrar_pbc_timeout, reg, NULL);
 	eloop_cancel_timeout(wps_registrar_set_selected_timeout, reg, NULL);
-	wps_free_pins(&reg->pins);
-	wps_free_nfc_pw_tokens(&reg->nfc_pw_tokens, 0);
-	wps_free_pbc_sessions(reg->pbc_sessions);
+	wps_registrar_flush(reg);
 	wpabuf_free(reg->extra_cred);
-	wps_free_devices(reg->devices);
 	os_free(reg);
 }
 

wpa_supplicant/ctrl_iface.c

@@ -5993,6 +5993,7 @@ static void wpa_supplicant_ctrl_iface_flush(struct wpa_supplicant *wpa_s)
 #ifdef CONFIG_WPS
 	wpa_s->wps_fragment_size = 0;
 	wpas_wps_cancel(wpa_s);
+	wps_registrar_flush(wpa_s->wps->registrar);
 #endif /* CONFIG_WPS */
 	wpa_s->after_wps = 0;
 	wpa_s->known_wps_freq = 0;