1 files changed, 4 insertions, 0 deletions
diff --git a/libs/hwui/ShadowTessellator.cpp b/libs/hwui/ShadowTessellator.cpp
index be49aed..55b82e4 100644
--- a/libs/hwui/ShadowTessellator.cpp
+++ b/libs/hwui/ShadowTessellator.cpp
@@ -196,6 +196,10 @@ Vector2 ShadowTessellator::centroid2d(const Vector2* poly, int polyLength) {
  * @param len the number of points of the polygon
  */
 bool ShadowTessellator::isClockwise(const Vector2* polygon, int len) {
+    if (len < 2 || polygon == NULL) {
+        ALOGW("Invalid polygon %p, length is %d @ isClockwise()", polygon, len);
+        return true;
+    }
     double sum = 0;
     double p1x = polygon[len - 1].x;
     double p1y = polygon[len - 1].y;