◎L×－－内核模式里的动态数组？？（获取USB配置描述符）

看了一个极为诡异的USB驱动例子
例子的用意是利用deviceExtention来保存USB设备的configuration描述符由于事先不可能知道有多少个configuration描述符，例子想用所谓的动态数组吧（i guess)：

typedef struct _DEVICE_EXTENSION{
???
PUSB_DEVICE_DESCRIPTOR DeviceDescriptor;
PUSB_CONFIGURATION_DESCRIPTOR * ConfigurationDescriptors;
???
} DEVICE_EXTENSION, *PDEVICE_EXTENSION;

然后这样使用它来保存取到的configuration descriptor,对吗

???
for (i = 0; i < deviceExtension->DeviceDescriptor->bNumConfigurations; i++)
{
// Get the configuration descriptor (first 9 bytes)
UCHAR tempBuffer[9];
descriptorBuffer = &tempBuffer;
if (!descriptorBuffer)
{
ntStatus = STATUS_NO_MEMORY;
return ntStatus;
}
ntStatus = GetDescriptor(DeviceObject,
USB_CONFIGURATION_DESCRIPTOR_TYPE,
(UCHAR)i,
0,
descriptorBuffer,
size);
if (!NT_SUCCESS(ntStatus))
{
return ntStatus;
}
// Now get the rest of the configuration descriptor & save
size = ((PUSB_CONFIGURATION_DESCRIPTOR)descriptorBuffer)->wTotalLength;
descriptorBuffer = ExAllocatePool(NonPagedPool, size);
if (!descriptorBuffer)
{
ntStatus = STATUS_NO_MEMORY;
return ntStatus;
}
ntStatus = GetDescriptor(DeviceObject,
USB_CONFIGURATION_DESCRIPTOR_TYPE,
(UCHAR)i,
0,
descriptorBuffer,
size);
if (!NT_SUCCESS(ntStatus))
{
return ntStatus;
}
deviceExtension->ConfigurationDescriptors【i】 =
(PUSB_CONFIGURATION_DESCRIPTOR)descriptorBuffer;
descriptorBuffer = NULL;
} // get all configuration descriptors

问题是：deviceExtension->ConfigurationDescriptors【i】 =
(PUSB_CONFIGURATION_DESCRIPTOR)descriptorBuffer;
descriptorBuffer = NULL;可以实现动态数组吗？

如何理解，请大虾不吝赐教