don't draw if maxVertices returns 0 or > than uin16_t max

This doesn't do anything about the issue of having too many indices, but it does move the fuzzer on to another assert.

BUG=skia:

Review URL: https://codereview.chromium.org/952993004

1 files changed, 5 insertions, 0 deletions

diff --git a/src/gpu/GrDefaultPathRenderer.cpp b/src/gpu/GrDefaultPathRenderer.cpp
index e4f54ccd61..131b518296 100644
--- a/src/gpu/GrDefaultPathRenderer.cpp
+++ b/src/gpu/GrDefaultPathRenderer.cpp
@@ -290,6 +290,11 @@ public:
             isIndexed = isIndexed || contourCount > 1;
         }
 
+        if (maxVertices == 0 || maxVertices > ((int)SK_MaxU16 + 1)) {
+            SkDebugf("Cannot render path (%d)\n", maxVertices);
+            return;
+        }
+
         // determine primitiveType
         int maxIndices = 0;
         GrPrimitiveType primitiveType;