Do not save an invalid network block in wpa_supplicant.conf

wpa_supplicant is going to reject a configuration file that uses
WPA/WPA2-Personal (the default key_mgmt), but does not define
passphrase/PSK. Refuse to save such a configuration to avoid getting
stuck with a configuration that wpa_supplicant will reject.

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

wpa_supplicant/config_file.c

@@ -753,6 +753,9 @@ int wpa_config_write(const char *name, struct wpa_config *config)
 	for (ssid = config->ssid; ssid; ssid = ssid->next) {
 		if (ssid->key_mgmt == WPA_KEY_MGMT_WPS || ssid->temporary)
 			continue; /* do not save temporary networks */
+		if (wpa_key_mgmt_wpa_psk(ssid->key_mgmt) && !ssid->psk_set &&
+		    !ssid->passphrase)
+			continue; /* do not save invalid network */
 		fprintf(f, "\nnetwork={\n");
 		wpa_config_write_network(f, ssid);
 		fprintf(f, "}\n");