* src/psaux/psobjs.c (t1_builder_close_contour): Add safety guard.

Reported as

  https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=941

ChangeLog

@@ -1,3 +1,11 @@
+2017-03-26  Werner Lemberg  <wl@gnu.org>
+
+	* src/psaux/psobjs.c (t1_builder_close_contour): Add safety guard.
+
+	Reported as
+
+	  https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=941
+
 2017-03-23  Werner Lemberg  <wl@gnu.org>
 
 	[psaux] Better protect `flex' handling.

src/psaux/psobjs.c

@@ -1718,6 +1718,14 @@
     first = outline->n_contours <= 1
             ? 0 : outline->contours[outline->n_contours - 2] + 1;
 
+    /* in malformed fonts it can happen that a contour was started */
+    /* but no points were added                                    */
+    if ( outline->n_contours && first == outline->n_points )
+    {
+      outline->n_contours--;
+      return;
+    }
+
     /* We must not include the last point in the path if it */
     /* is located on the first point.                       */
     if ( outline->n_points > 1 )