一个调用ZwOpenSymbolicLinkObject时的问题？？

下面的代码是我放在文件隐藏中的代码：
UNICODE_STRING *pFullPath=NULL;
.....
pFullPath = (UNICODE_STRING *)ExAllocatePool(PagedPool,1024);
RtlZeroMemory(pFullPath,1024);
pFullPath->Length=1024;
pFullPath->MaximumLength = 1024;
rc = ObQueryNameString(pFileObject,pFullPath,1024,&ActualLength);
if(rc != STATUS_SUCCESS)
{
ExFreePool(&pFullPath);
ObDereferenceObject(pFileObject);
return rc;
}
DbgPrint("OK.Query Full Dir = %ws\n",pFullPath->Buffer);
InitializeObjectAttributes(&ObjectAttributes,pFullPath,OBJ_CASE_INSENSITIVE,NULL,NULL);
rc=ZwOpenSymbolicLinkObject(&TestLink,GENERIC_READ,&ObjectAttributes);
if(rc != STATUS_SUCCESS)
{
return rc;
}

在DbgPrint时内容正确"\Device\HarddiskVolumel1",可是运行到ZwOpenSymbolicLinkObject当我打开c盘时系统就会提示“句柄无效 c:”

运行下面的代码时，系统就会重起。
UNICODE_STRING *pFullPath=NULL;
.....
pFullPath->Buffer = (WCHAR*)ExAllocatePool(PagedPool,1024);
RtlZeroMemory(pFullPath->Buffer,1024);
pFullPath->Length=1024;
pFullPath->MaximumLength = 1024;
rc = ObQueryNameString(pFileObject,pFullPath,1024,&ActualLength);
if(rc != STATUS_SUCCESS)
{
ExFreePool(&pFullPath);
ObDereferenceObject(pFileObject);
return rc;
}
DbgPrint("OK.Query Full Dir = %wsn",pFullPath->Buffer);
InitializeObjectAttributes(&ObjectAttributes,pFullPath,OBJ_CASE_INSENSITIVE,NULL,NULL);
rc=ZwOpenSymbolicLinkObject(&TestLink,GENERIC_READ,&ObjectAttributes);
if(rc != STATUS_SUCCESS)
{
return rc;
}

各位有没有人帮帮我呀！！