RtlCopyMemory 崩溃

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deviceExtension = (PDEVICE_EXTENSION)DeviceObject->DeviceExtension;   deviceExtension->file_name.Length = openFileInformation->file_nameLength; deviceExtension->file_name.MaximumLength = openFileInformation->file_nameLength; deviceExtension->file_name.Buffer = (PCHAR)ExAllocatePool(NonPagedPool, openFileInformation->file_nameLength);   RtlCopyMemory(     deviceExtension->file_name.Buffer,     openFileInformation->file_name,     openFileInformation->file_nameLength     );