Qt运行这段代码，用delete 释放pathStr指针，程序异常退出，什么原因啊？

int32 CEngine::mergePsrConfigFile(uint32 handle, QString filePath)
{
    char *pathStr = nullptr;
    pathStr = new char;
    QByteArray ba = filePath.toLatin1();
    pathStr = ba.data();

    qDebug() << "merge配置文件。。。";
    int32 result = psMergeFromFile(handle, pathStr);
    if (result == TE_OK)
    {
        delete pathStr;
        return 0;
    }
    else
    {
                delete pathStr;
        return -1;
    }
}