Break infinite recursion that leads to segfault.

diff --git a/lib/dotgen/compound.c b/lib/dotgen/compound.c
index ac78cd577437e0aa13ba3e9c6d9b40f1d06e43d9..7156103af7a271337d917e73a2fa5e443c9a8d8e 100644 (file)
--- a/lib/dotgen/compound.c
+++ b/lib/dotgen/compound.c
@@ -176,6 +176,9 @@ findVertical(pointf * pts, double tmin, double tmax,
     double t;
     int no_cross = countVertCross(pts, xcoord);
 
+    if (tmin >= tmax)
+       return -1.0;
+
     if (no_cross == 0)
        return -1.0;
 
@@ -214,6 +217,9 @@ findHorizontal(pointf * pts, double tmin, double tmax,
     double t;
     int no_cross = countHorzCross(pts, ycoord);
 
+    if (tmin >= tmax)
+       return -1.0;
+
     if (no_cross == 0)
        return -1.0;