NTSTATUS processIoctlRequest(
    DEVICE_OBJECT* DeviceObject,
    IRP* Irp
)
{
    PIO_STACK_LOCATION  pstack = IoGetCurrentIrpStackLocation(Irp);

    int pstatus = 0;
    int inputInt = 0;

    __try
    {
        // if system offsets not supported / disable features 
        // that require the use of offsets to avoid crash
        if (pstack->Parameters.DeviceIoControl.IoControlCode >= HIDE_PROC && \
            pstack->Parameters.DeviceIoControl.IoControlCode <= UNPROTECT_ALL_PROCESSES && xHooklist.check_off)
        {
            pstatus = ERROR_UNSUPPORTED_OFFSET;
            __leave;
        }
        switch (pstack->Parameters.DeviceIoControl.IoControlCode)
        {
        case HIDE_PROC:
        {
            if (pstack->Parameters.DeviceIoControl.InputBufferLength < sizeof(int))
            {
                pstatus = STATUS_BUFFER_TOO_SMALL;
                break;
            }
            RtlCopyMemory(&inputInt, Irp->AssociatedIrp.SystemBuffer, sizeof(inputInt));

            pstatus = HideProcess(inputInt);

            DbgPrint("Received input value: %d\n", inputInt);
            break;
        }
//...
    }
}

DWORD
HideProcess(
    int pid
)
{
    //...
    BOOLEAN lockAcquired = FALSE;

    __try
    {
        __try
        {
	        //...
            ExAcquirePushLockExclusive(&pLock);
            lockAcquired = TRUE;
            //...
        }
        //...
    }
    __finally
    {
        //...
        if (lockAcquired)
            ExReleasePushLockExclusive(&pLock);
    }
    return (status);
}