FPDF_GetSecurityHandlerRevision() should not crash.

Same for FPDF_GetDocPermissions().
Empty documents do not have parsers.

BUG=pdfium:465

Review URL: https://codereview.chromium.org/1865523003

2 files changed, 32 insertions, 2 deletions

diff --git a/fpdfsdk/fpdfview.cpp b/fpdfsdk/fpdfview.cpp
index df7518902f..3f02feeadf 100644
--- a/fpdfsdk/fpdfview.cpp
+++ b/fpdfsdk/fpdfview.cpp
@@ -463,7 +463,7 @@ DLLEXPORT FPDF_BOOL STDCALL FPDF_GetFileVersion(FPDF_DOCUMENT doc,
 // header).
 DLLEXPORT unsigned long STDCALL FPDF_GetDocPermissions(FPDF_DOCUMENT document) {
   CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
-  if (!pDoc)
+  if (!pDoc || !pDoc->GetParser())
 #ifndef PDF_ENABLE_XFA
     return 0;
 #else   // PDF_ENABLE_XFA
@@ -476,7 +476,7 @@ DLLEXPORT unsigned long STDCALL FPDF_GetDocPermissions(FPDF_DOCUMENT document) {
 
 DLLEXPORT int STDCALL FPDF_GetSecurityHandlerRevision(FPDF_DOCUMENT document) {
   CPDF_Document* pDoc = CPDFDocumentFromFPDFDocument(document);
-  if (!pDoc)
+  if (!pDoc || !pDoc->GetParser())
     return -1;
 
   CPDF_Dictionary* pDict = pDoc->GetParser()->GetEncryptDict();
diff --git a/fpdfsdk/fpdfview_embeddertest.cpp b/fpdfsdk/fpdfview_embeddertest.cpp
index 10fe3aa822..2ccbfd00d3 100644
--- a/fpdfsdk/fpdfview_embeddertest.cpp
+++ b/fpdfsdk/fpdfview_embeddertest.cpp
@@ -29,6 +29,36 @@ TEST_F(FPDFViewEmbeddertest, Document) {
   EXPECT_EQ(-1, FPDF_GetSecurityHandlerRevision(document()));
 }
 
+// See bug 465.
+TEST_F(FPDFViewEmbeddertest, EmptyDocument) {
+  EXPECT_TRUE(CreateEmptyDocument());
+
+  {
+    int version = 42;
+    EXPECT_FALSE(FPDF_GetFileVersion(document(), &version));
+    EXPECT_EQ(0, version);
+  }
+
+  {
+#ifndef PDF_ENABLE_XFA
+    const unsigned long kExpected = 0;
+#else
+    const unsigned long kExpected = static_cast<uint32_t>(-1);
+#endif
+    EXPECT_EQ(kExpected, FPDF_GetDocPermissions(document()));
+  }
+
+  EXPECT_EQ(-1, FPDF_GetSecurityHandlerRevision(document()));
+
+  EXPECT_EQ(0, FPDF_GetPageCount(document()));
+
+  EXPECT_TRUE(FPDF_VIEWERREF_GetPrintScaling(document()));
+  EXPECT_EQ(1, FPDF_VIEWERREF_GetNumCopies(document()));
+  EXPECT_EQ(DuplexUndefined, FPDF_VIEWERREF_GetDuplex(document()));
+
+  EXPECT_EQ(0, FPDF_CountNamedDests(document()));
+}
+
 TEST_F(FPDFViewEmbeddertest, Page) {
   EXPECT_TRUE(OpenDocument("about_blank.pdf"));
   FPDF_PAGE page = LoadPage(0);