diff --git a/components/connectivity/qcloud-iot-hub-sdk-3.1.2/port/TencentOS_tiny/HAL_Device_tencentos_tiny.c b/components/connectivity/qcloud-iot-hub-sdk-3.1.2/port/TencentOS_tiny/HAL_Device_tencentos_tiny.c
index 4646e8d1..c3c32fee 100644
--- a/components/connectivity/qcloud-iot-hub-sdk-3.1.2/port/TencentOS_tiny/HAL_Device_tencentos_tiny.c
+++ b/components/connectivity/qcloud-iot-hub-sdk-3.1.2/port/TencentOS_tiny/HAL_Device_tencentos_tiny.c
@@ -143,11 +143,13 @@ int HAL_GetGwDevInfo(void *pgwDeviceInfo)
 	//only one sub-device is supported now
 	gwDevInfo->sub_dev_num = 1;
 	gwDevInfo->sub_dev_info = (DeviceInfo *)HAL_Malloc(sizeof(DeviceInfo)*(gwDevInfo->sub_dev_num));
-	memset((char *)gwDevInfo->sub_dev_info, '\0', sizeof(DeviceInfo));
-	//copy sub dev info
-	ret = device_info_copy(gwDevInfo->sub_dev_info->product_id, sg_sub_device_product_id, MAX_SIZE_OF_PRODUCT_ID);
-	ret |= device_info_copy(gwDevInfo->sub_dev_info->device_name, sg_sub_device_name, MAX_SIZE_OF_DEVICE_NAME);
-
+	if(gwDevInfo->sub_dev_info)
+	{
+	    memset((char *)gwDevInfo->sub_dev_info, '\0', sizeof(DeviceInfo));
+	    //copy sub dev info
+	    ret = device_info_copy(gwDevInfo->sub_dev_info->product_id, sg_sub_device_product_id, MAX_SIZE_OF_PRODUCT_ID);
+	    ret |= device_info_copy(gwDevInfo->sub_dev_info->device_name, sg_sub_device_name, MAX_SIZE_OF_DEVICE_NAME);
+	}
 #else
 	Log_e("HAL_GetDevInfo not implement yet");
 	ret = QCLOUD_ERR_DEV_INFO;