Fix a leak with FPDFPageObj_NewImgeObj().

fpdfsdk/fpdfeditimg_unittest.cpp

+// Copyright 2016 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "public/fpdf_edit.h"
+
+#include "core/fpdfapi/include/cpdf_modulemgr.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+class PDFEditTest : public testing::Test {
+  void SetUp() override {
+    CPDF_ModuleMgr* module_mgr = CPDF_ModuleMgr::Get();
+    module_mgr->InitPageModule();
+  }
+
+  void TearDown() override { CPDF_ModuleMgr::Destroy(); }
+};
+
+TEST_F(PDFEditTest, InsertObjectWithInvalidPage) {
+  FPDF_DOCUMENT doc = FPDF_CreateNewDocument();
+  FPDF_PAGE page = FPDFPage_New(doc, 0, 100, 100);
+  EXPECT_EQ(0, FPDFPage_CountObject(page));
+
+  FPDFPage_InsertObject(nullptr, nullptr);
+  EXPECT_EQ(0, FPDFPage_CountObject(page));
+
+  FPDFPage_InsertObject(page, nullptr);
+  EXPECT_EQ(0, FPDFPage_CountObject(page));
+
+  FPDF_PAGEOBJECT page_image = FPDFPageObj_NewImgeObj(doc);
+  FPDFPage_InsertObject(nullptr, page_image);
+  EXPECT_EQ(0, FPDFPage_CountObject(page));
+
+  FPDF_ClosePage(page);
+  FPDF_CloseDocument(doc);
+}
+
+// https://bugs.chromium.org/p/pdfium/issues/detail?id=545
+// TODO(thestig): Add another test case that also calls
+// FPDFPage_GenerateContent().
+TEST_F(PDFEditTest, NewImgeObj) {
+  FPDF_DOCUMENT doc = FPDF_CreateNewDocument();
+  FPDF_PAGE page = FPDFPage_New(doc, 0, 100, 100);
+  EXPECT_EQ(0, FPDFPage_CountObject(page));
+
+  FPDF_PAGEOBJECT page_image = FPDFPageObj_NewImgeObj(doc);
+  FPDFPage_InsertObject(page, page_image);
+  EXPECT_EQ(1, FPDFPage_CountObject(page));
+
+  FPDF_ClosePage(page);
+  FPDF_CloseDocument(doc);
+}