Remove potential division by 0 in gfxmenu.

ChangeLog

@@ -1,3 +1,7 @@
+2015-01-20  Vladimir Serbinenko  <phcoder@gmail.com>
+
+	Remove potential division by 0 in gfxmenu.
+
 2015-01-20  Vladimir Serbinenko  <phcoder@gmail.com>
 
 	* grub-core/normal/menu_text.c (grub_menu_init_page): Avoid

grub-core/gfxmenu/gui_circular_progress.c

@@ -138,6 +138,8 @@ circprog_paint (void *vself, const grub_video_rect_t *region)
                           (height - center_height) / 2, 0, 0,
                           center_width, center_height);
 
+  if (self->num_ticks)
+    {
       int radius = grub_min (height, width) / 2 - grub_max (tick_height, tick_width) / 2 - 1;
       unsigned nticks;
       unsigned tick_begin;
@@ -182,7 +184,7 @@ circprog_paint (void *vself, const grub_video_rect_t *region)
 	  grub_video_blit_bitmap (self->tick_bitmap, GRUB_VIDEO_BLIT_BLEND,
 				  x, y, 0, 0, tick_width, tick_height);
 	}
-
+    }
   grub_gui_restore_viewport (&vpsave);
 }
 

grub-core/gfxmenu/gui_list.c

@@ -131,6 +131,9 @@ get_num_shown_items (list_impl_t self)
   int max_top_pad = grub_max (item_top_pad, sel_top_pad);
   int max_bottom_pad = grub_max (item_bottom_pad, sel_bottom_pad);
 
+  if (item_height + item_vspace <= 0)
+    return 1;
+
   return (self->bounds.height + item_vspace - 2 * boxpad
           - max_top_pad - max_bottom_pad
           - box_top_pad - box_bottom_pad) / (item_height + item_vspace);

grub-core/gfxmenu/gui_progress_bar.c

@@ -118,7 +118,13 @@ draw_filled_rect_bar (grub_gui_progress_bar_t self)
                         f.width + 2, f.height + 2);
 
   /* Bar background.  */
-  int barwidth = (f.width
+  unsigned barwidth;
+
+  if (self->end <= self->start
+      || self->value <= self->start)
+    barwidth = 0;
+  else
+    barwidth = (f.width
 		* (self->value - self->start)
 		/ (self->end - self->start));
   grub_video_fill_rect (grub_video_map_rgba_color (self->bg_color),