fix skp fuzz

src/core/SkPictureData.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include <new>
 #include "SkImageGenerator.h"
 #include "SkPictureData.h"
 #include "SkPictureRecord.h"
@@ skipping 395 matching lines @@
             SkAutoMalloc storage(size);
             if (stream->read(storage.get(), size) != size) {
                 return false;
             }
 
             /* Should we use SkValidatingReadBuffer instead? */
             SkReadBuffer buffer(storage.get(), size);
             buffer.setFlags(pictInfoFlagsToReadBufferFlags(fInfo.fFlags));
             buffer.setVersion(fInfo.fVersion);
 
+            if (!fFactoryPlayback) {
+                return false;
+            }
             fFactoryPlayback->setupBuffer(buffer);
             buffer.setBitmapDecoder(proc);
 
             if (fTFPlayback.count() > 0) {
                 // .skp files <= v43 have typefaces serialized with each sub picture.
                 fTFPlayback.setupBuffer(buffer);
             } else {
                 // Newer .skp files serialize all typefaces with the top picture.
                 topLevelTFPlayback->setupBuffer(buffer);
             }
@@ skipping 199 matching lines @@
     }
 }
 
 bool SkPictureData::suitableForLayerOptimization() const {
     return fContentInfo.numLayers() > 0;
 }
 #endif
 ///////////////////////////////////////////////////////////////////////////////