Fix a crash in SkParsePath::FromSVGString

src/utils/SkParsePath.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 "SkParse.h"
 #include "SkParsePath.h"
 
@@ skipping 59 matching lines @@
 bool SkParsePath::FromSVGString(const char data[], SkPath* result) {
     SkPath path;
     SkPoint f = {0, 0};
     SkPoint c = {0, 0};
     SkPoint lastc = {0, 0};
     SkPoint points[3];
     char op = '\0';
     char previousOp = '\0';
     bool relative = false;
     for (;;) {
+        if (!data) {
+            // Truncated data
+            return false;
+        }
         data = skip_ws(data);
         if (data[0] == '\0') {
             break;
         }
         char ch = data[0];
         if (is_digit(ch) || ch == '-' || ch == '+') {
             if (op == '\0') {
                 return false;
             }
         } else if (is_sep(ch)) {
@@ skipping 152 matching lines @@
             case SkPath::kClose_Verb:
                 stream.write("Z", 1);
                 break;
             case SkPath::kDone_Verb:
                 str->resize(stream.getOffset());
                 stream.copyTo(str->writable_str());
             return;
         }
     }
 }