From 5d21f5389ad7edd3b959ccfcc98f105417b5f247 Mon Sep 17 00:00:00 2001
From: Anduin1109 <liuchunyu20@huawei.com>
Date: Sat, 30 Aug 2025 11:09:58 +0800
Subject: [PATCH] fix GetTty crash

Signed-off-by: Anduin1109 <liuchunyu20@huawei.com>
---
 usb/serial/src/libusb_serial.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/usb/serial/src/libusb_serial.cpp b/usb/serial/src/libusb_serial.cpp
index 7664e8ae0e..a25a4c6b63 100644
--- a/usb/serial/src/libusb_serial.cpp
+++ b/usb/serial/src/libusb_serial.cpp
@@ -606,7 +606,7 @@ std::string GetTtyDevicePath(const std::string& ttyDevice)
     fs::path ttyPath(ttyPathStr);
     if (!fs::exists(ttyPath) || !fs::is_symlink(ttyPath)) {
         HDF_LOGE("%{public}s: path %{public}s not exist", __func__, ttyPath.string().c_str());
-        return NULL;
+        return "";
     }
     fs::path realPath = fs::read_symlink(ttyPath);
     std::string tempPath = ttyPath.parent_path().string() + "/" + realPath.string();
-- 
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