cliptest: Avoid use of uninitialized memory when regions don't intersect
Prevent attempting to draw the intersection polygon when it contains no
vertices.
Signed-off-by: Derek Foreman <derekf@osg.samsung.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
diff --git a/clients/cliptest.c b/clients/cliptest.c
index 612b3d1..907c5d4 100644
--- a/clients/cliptest.c
+++ b/clients/cliptest.c
@@ -570,12 +570,14 @@
cairo_set_source_rgba(cr, 0.0, 0.0, 1.0, 0.4);
cairo_fill(cr);
- draw_polygon_closed(cr, ex, ey, n);
- cairo_set_source_rgb(cr, 0.0, 1.0, 0.0);
- cairo_stroke(cr);
+ if (n) {
+ draw_polygon_closed(cr, ex, ey, n);
+ cairo_set_source_rgb(cr, 0.0, 1.0, 0.0);
+ cairo_stroke(cr);
- cairo_set_source_rgba(cr, 0.0, 1.0, 0.0, 0.5);
- draw_polygon_labels(cr, ex, ey, n);
+ cairo_set_source_rgba(cr, 0.0, 1.0, 0.0, 0.5);
+ draw_polygon_labels(cr, ex, ey, n);
+ }
}
static void