FwpmSubLayerEnum0和FwpmFreeMemory0 [英] FwpmSubLayerEnum0 and FwpmFreeMemory0

问题描述

我有一个WFP标注驱动程序，它通过FwpmSubLayerEnum0枚举子图层。基于
的文档
http://msdn.microsoft.com/en-us/library/windows/hardware/aa364211(v=vs.85).aspx:

" The返回的条目数组（但不是单独的条目本身）必须通过调用FwpmFreeMemory0来释放。"

这是正确的吗？我没有看到在Windows 8 WFP采样器示例中这样做的位置。它的PrvCleanPolicy（）函数不会释放任何枚举资源，除了模板和句柄。 另外，如果我调用FwpmFreeMemory0（），我会点击BSOD。

什么是正确的要释放由FwpmSubLayerEnum0的条目
参数引用的数组的操作？

解决方案

这是WFPSampler中的一个错误。 你应该释放这样的内存：

 ///枚举并刷新所有不属于WFPSampler的子层
 status = HlprFwpmSubLayerCreateEnumHandle（engineHandle，
 0，
& enumHandle）; 
 HLPR_BAIL_ON_FAILURE（状态）; 
 
 status = HlprFwpmSubLayerEnum（engineHandle，
 enumHandle，
 0xFFFFFFFF，
& ppSubLayers，
& numEntries）; 
 if（status == NO_ERROR&& 
 ppSubLayers&& 
 numEntries）
 {
 for（UINT32 subLayerIndex = 0; 
 subLayerIndex < numEntries; 
 subLayerIndex ++）
 {
 if（！HlprGUIDsAreEqual（ppSubLayers [subLayerIndex]  - > providerKey，
& WFPSAMPLER_PROVIDER））
 HlprFwpmSubLayerDeleteByKey（engineHandle， 
&（ppSubLayers [subLayerIndex]  - > subLayerKey））; 
} 
 
 FwpmFreeMemory（（VOID **）& ppSubLayers）; 
 
 ppSubLayers = 0; 
 
 numEntries = 0; 
} 

修复应该是WFPSampler的下一滴。

谢谢，

I have a WFP callout driver that is enumerating sublayers through FwpmSubLayerEnum0. Based on the documentation at http://msdn.microsoft.com/en-us/library/windows/hardware/aa364211(v=vs.85).aspx:

"The returned array of entries (but not the individual entries themselves) must be freed by a call to FwpmFreeMemory0."

Is this correct? I don't see where this is done in the Windows 8 WFP sampler sample. It's PrvCleanPolicy() function does not free any enum resources except for the templates and handles. Also, if I do call FwpmFreeMemory0(), I hit a BSOD.

What is the correct action to take to free the array referenced by the entries argument of FwpmSubLayerEnum0?

解决方案

This is a bug in the WFPSampler.  You should be freeing the memory like this:

      /// Enumerate and flush all sublayers not owned by WFPSampler
      status = HlprFwpmSubLayerCreateEnumHandle(engineHandle,
                                                0,
                                                &enumHandle);
      HLPR_BAIL_ON_FAILURE(status);

      status = HlprFwpmSubLayerEnum(engineHandle,
                                    enumHandle,
                                    0xFFFFFFFF,
                                    &ppSubLayers,
                                    &numEntries);
      if(status == NO_ERROR &&
         ppSubLayers &&
         numEntries)
      {
         for(UINT32 subLayerIndex = 0;
             subLayerIndex < numEntries;
             subLayerIndex++)
         {
            if(!HlprGUIDsAreEqual(ppSubLayers[subLayerIndex]->providerKey,
                                  &WFPSAMPLER_PROVIDER))
               HlprFwpmSubLayerDeleteByKey(engineHandle,
                                           &(ppSubLayers[subLayerIndex]->subLayerKey));
         }

         FwpmFreeMemory((VOID**)&ppSubLayers);

         ppSubLayers = 0;

         numEntries = 0;
      }

The fix should be in teh next drop of the WFPSampler.

Thanks,

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