40a41,44
> 
> #define CLAMPMAX(x, max)  (((x) > (max)) ? (max) : (x));
> 
> 
262,265c266,269
< 	info.image_width = mode[i].imageWidth;
< 	info.image_height = mode[i].imageHeight;
< 	info.pixmap_width = mode[i].pixmapWidth;
< 	info.pixmap_height = mode[i].pixmapHeight;
---
> 	info.image_width = CLAMPMAX(mode[i].imageWidth, (CARD16) -1);
> 	info.image_height = CLAMPMAX(mode[i].imageHeight, (CARD16) -1);
> 	info.pixmap_width = CLAMPMAX(mode[i].pixmapWidth, (CARD16) -1);
> 	info.pixmap_height = CLAMPMAX(mode[i].pixmapHeight, (CARD16) -1);
271,276c275,280
< 	info.viewport_width = mode[i].viewportWidth;
< 	info.viewport_height = mode[i].viewportHeight;
< 	info.viewport_xstep = mode[i].xViewportStep;
< 	info.viewport_ystep = mode[i].yViewportStep;
<  	info.viewport_xmax = mode[i].maxViewportX;
< 	info.viewport_ymax = mode[i].maxViewportY;
---
> 	info.viewport_width = CLAMPMAX(mode[i].viewportWidth, (CARD16) -1);
> 	info.viewport_height = CLAMPMAX(mode[i].viewportHeight, (CARD16) -1);
> 	info.viewport_xstep = CLAMPMAX(mode[i].xViewportStep, (CARD16) -1);
> 	info.viewport_ystep = CLAMPMAX(mode[i].yViewportStep, (CARD16) -1);
>  	info.viewport_xmax = CLAMPMAX(mode[i].maxViewportX, (CARD16) -1);
> 	info.viewport_ymax = CLAMPMAX(mode[i].maxViewportY, (CARD16) -1);