case IOCTL_HELLO_Read:
	  {
		  if (NT_SUCCESS(PsLookupProcessByProcessId((HANDLE)((PREAD_WRITE_INFO)pIoBuffer)->uPid, &pEprocess)))
		  {
				  KeStackAttachProcess((PRKPROCESS)pEprocess, &apc_state);
				  if (MmIsAddressValid((PVOID)((PREAD_WRITE_INFO)pIoBuffer)->Dst))
				  {
					  __try
					  {
						RtlCopyMemory(pIoBuffer, (PVOID)((PREAD_WRITE_INFO)pIoBuffer)->Dst, ((PREAD_WRITE_INFO)pIoBuffer)->uSize);
					  }
					  __except (EXCEPTION_EXECUTE_HANDLER)
					  {
						dprintf("Hello:IOCTL_HELLO_Read __except\r\n");
					  }
				  }
				  else
				  {
					  RtlZeroMemory(pIoBuffer, uInSize);
				  }
				  KeUnstackDetachProcess(&apc_state);
		  }
		  else
		  {
			  RtlZeroMemory(pIoBuffer, uInSize);
		  }
		  break;
	  }

问一下哪里存在问题