diff -urN linux-2.4.25-pre4/drivers/usb/vicam.c linux-2.4.25-pre5/drivers/usb/vicam.c
--- linux-2.4.25-pre4/drivers/usb/vicam.c	2003-11-28 10:26:20.000000000 -0800
+++ linux-2.4.25-pre5/drivers/usb/vicam.c	2004-01-15 12:10:23.000000000 -0800
@@ -601,12 +601,19 @@
 	case VIDIOCSWIN:
 		{
 
-			struct video_window *vw = (struct video_window *) arg;
-			DBG("VIDIOCSWIN %d x %d\n", vw->width, vw->height);
+			struct video_window vw;
 
-			if ( vw->width != 320 || vw->height != 240 )
+			if (copy_from_user(&vw, arg, sizeof(vw)))
+			{
 				retval = -EFAULT;
+				break;
+			}
+
+			DBG("VIDIOCSWIN %d x %d\n", vw->width, vw->height);
 			
+			if ( vw.width != 320 || vw.height != 240 )
+				retval = -EFAULT;
+
 			break;
 		}