写东西之前都不看官方例子的么？
https://github.com/microsoft/Windows-driver-samples/tree/master/general/ioctl/wdm

            irp->MdlAddress = IoAllocateMdl( Buffer,
                                             Length,
                                             FALSE,
                                             FALSE,
                                             NULL );

            if (irp->MdlAddress == NULL) {
                IoFreeIrp( irp );
                return (PIRP) NULL;
            }

            try {
                MmProbeAndLockPages( irp->MdlAddress,
                                     KernelMode,
                                     (LOCK_OPERATION) (MajorFunction == IRP_MJ_READ ? IoWriteAccess : IoReadAccess) );
            } except(EXCEPTION_EXECUTE_HANDLER) {
                  if (irp->MdlAddress != NULL) {
                      IoFreeMdl( irp->MdlAddress );
                  }
                  IoFreeIrp( irp );
                  return (PIRP) NULL;
            }

谢谢大佬们的回答