commit be2b172886a73ce5bbdc41b4cdc57b36e246618c
author Stephen White <senorblanco@chromium.org> Thu Mar 09 16:33:44 2017 -0500
committer Stephen White <senorblanco@chromium.org> Thu Mar 09 21:51:28 2017 +0000
tree 3f92484a82f2690dba81c424d15857d8e82feaf7
parent 987c2314544c490940a70f00b174059383f9ed6c

GrTessellator: add a null-check for a clusterfuzz test case.

[Cherry-pick of 90732fd36e22cbf0699ab1d0f08eb7e247dda30b to M58 branch.]

BUG=695696

Change-Id: I1c001316721b3c042cff115c905ff0d2c2698ac0
Reviewed-on: https://skia-review.googlesource.com/9053
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Stephen White <senorblanco@chromium.org>
Reviewed-on: https://skia-review.googlesource.com/9501
Reviewed-by: Stephen White <senorblanco@chromium.org>

src/gpu/GrTessellator.cpp

diff --git a/src/gpu/GrTessellator.cpp b/src/gpu/GrTessellator.cpp
index 3271b12..b6d3147 100644
--- a/src/gpu/GrTessellator.cpp
+++ b/src/gpu/GrTessellator.cpp
@@ -792,7 +792,7 @@
 }
 
 void find_enclosing_edges(Vertex* v, EdgeList* edges, Edge** left, Edge** right) {
-    if (v->fFirstEdgeAbove) {
+    if (v->fFirstEdgeAbove && v->fLastEdgeAbove) {
         *left = v->fFirstEdgeAbove->fLeft;
         *right = v->fLastEdgeAbove->fRight;
         return;