DPP: Allow testing override values to be cleared

This allows wpa_supplicant dpp_config_obj_override,
dpp_discovery_override, and dpp_groups_override parameters to be cleared
by setting them to a zero-length value.

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

wpa_supplicant/ctrl_iface.c

@@ -646,13 +646,22 @@ static int wpa_supplicant_ctrl_iface_set(struct wpa_supplicant *wpa_s,
 #ifdef CONFIG_DPP
 	} else if (os_strcasecmp(cmd, "dpp_config_obj_override") == 0) {
 		os_free(wpa_s->dpp_config_obj_override);
-		wpa_s->dpp_config_obj_override = os_strdup(value);
+		if (value[0] == '\0')
+			wpa_s->dpp_config_obj_override = NULL;
+		else
+			wpa_s->dpp_config_obj_override = os_strdup(value);
 	} else if (os_strcasecmp(cmd, "dpp_discovery_override") == 0) {
 		os_free(wpa_s->dpp_discovery_override);
-		wpa_s->dpp_discovery_override = os_strdup(value);
+		if (value[0] == '\0')
+			wpa_s->dpp_discovery_override = NULL;
+		else
+			wpa_s->dpp_discovery_override = os_strdup(value);
 	} else if (os_strcasecmp(cmd, "dpp_groups_override") == 0) {
 		os_free(wpa_s->dpp_groups_override);
-		wpa_s->dpp_groups_override = os_strdup(value);
+		if (value[0] == '\0')
+			wpa_s->dpp_groups_override = NULL;
+		else
+			wpa_s->dpp_groups_override = os_strdup(value);
 	} else if (os_strcasecmp(cmd,
 				 "dpp_ignore_netaccesskey_mismatch") == 0) {
 		wpa_s->dpp_ignore_netaccesskey_mismatch = atoi(value);
@@ -7782,6 +7791,12 @@ static void wpa_supplicant_ctrl_iface_flush(struct wpa_supplicant *wpa_s)
 	wpabuf_free(wpa_s->sae_commit_override);
 	wpa_s->sae_commit_override = NULL;
 #ifdef CONFIG_DPP
+	os_free(wpa_s->dpp_config_obj_override);
+	wpa_s->dpp_config_obj_override = NULL;
+	os_free(wpa_s->dpp_discovery_override);
+	wpa_s->dpp_discovery_override = NULL;
+	os_free(wpa_s->dpp_groups_override);
+	wpa_s->dpp_groups_override = NULL;
 	dpp_test = DPP_TEST_DISABLED;
 #endif /* CONFIG_DPP */
 #endif /* CONFIG_TESTING_OPTIONS */