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--- ./nx-X11/programs/Xserver/fb/fbtrap.c.X.original 2015-02-13 14:03:44.704442298 +0100
+++ ./nx-X11/programs/Xserver/fb/fbtrap.c 2015-02-10 19:13:14.156672722 +0100
@@ -115,6 +115,9 @@
RenderEdge l, r;
xFixed t, b;
+ if (!xTrapezoidValid (trap))
+ return;
+
fbGetDrawable (pPicture->pDrawable, buf, stride, bpp, pxoff, pyoff);
width = pPicture->pDrawable->width;
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