--- ioperm-0.4/driver/ioperm.c~	2003-01-31 09:08:58.000000000 -0600
+++ ioperm-0.4/driver/ioperm.c	2008-02-19 09:17:17.875000000 -0600
@@ -94,7 +94,7 @@
 
 		/* test input buffer size and parameters */
 		if ((io_stack->Parameters.DeviceIoControl.InputBufferLength < sizeof (struct ioperm_data))
-			|| (!ioperm_data) || (ioperm_data->from + ioperm_data->num > 0x400))
+			|| (!ioperm_data) || (ioperm_data->from + ioperm_data->num > 0x10000))
 		{
 			Irp->IoStatus.Status = STATUS_INVALID_PARAMETER;
 		} else {