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-rw-r--r--core/fpdfapi/fpdf_parser/cpdf_array.cpp2
-rw-r--r--core/fpdfapi/fpdf_parser/cpdf_dictionary.cpp2
-rw-r--r--core/fpdfapi/fpdf_parser/cpdf_object.cpp4
-rw-r--r--core/fpdfapi/fpdf_parser/cpdf_object_unittest.cpp32
-rw-r--r--core/fpdfapi/fpdf_parser/cpdf_parser.cpp37
-rw-r--r--core/fpdfapi/fpdf_parser/cpdf_stream.cpp6
6 files changed, 47 insertions, 36 deletions
diff --git a/core/fpdfapi/fpdf_parser/cpdf_array.cpp b/core/fpdfapi/fpdf_parser/cpdf_array.cpp
index 26e65bca34..a3be55b9f0 100644
--- a/core/fpdfapi/fpdf_parser/cpdf_array.cpp
+++ b/core/fpdfapi/fpdf_parser/cpdf_array.cpp
@@ -23,7 +23,7 @@ CPDF_Array::~CPDF_Array() {
// in case of cyclic references.
m_ObjNum = kInvalidObjNum;
for (auto& it : m_Objects) {
- if (it)
+ if (it && it->GetObjNum() != kInvalidObjNum)
it->Release();
}
}
diff --git a/core/fpdfapi/fpdf_parser/cpdf_dictionary.cpp b/core/fpdfapi/fpdf_parser/cpdf_dictionary.cpp
index 5696fc0c8d..eb40de7d49 100644
--- a/core/fpdfapi/fpdf_parser/cpdf_dictionary.cpp
+++ b/core/fpdfapi/fpdf_parser/cpdf_dictionary.cpp
@@ -30,7 +30,7 @@ CPDF_Dictionary::~CPDF_Dictionary() {
// in case of cyclic references.
m_ObjNum = kInvalidObjNum;
for (const auto& it : m_Map) {
- if (it.second)
+ if (it.second && it.second->GetObjNum() != kInvalidObjNum)
it.second->Release();
}
}
diff --git a/core/fpdfapi/fpdf_parser/cpdf_object.cpp b/core/fpdfapi/fpdf_parser/cpdf_object.cpp
index ba7490a13f..d74003112f 100644
--- a/core/fpdfapi/fpdf_parser/cpdf_object.cpp
+++ b/core/fpdfapi/fpdf_parser/cpdf_object.cpp
@@ -38,9 +38,7 @@ CPDF_Object* CPDF_Object::CloneNonCyclic(
}
void CPDF_Object::Release() {
- if (m_ObjNum)
- return;
-
+ CHECK(!m_ObjNum);
delete this;
}
diff --git a/core/fpdfapi/fpdf_parser/cpdf_object_unittest.cpp b/core/fpdfapi/fpdf_parser/cpdf_object_unittest.cpp
index 9b702099bb..6181571229 100644
--- a/core/fpdfapi/fpdf_parser/cpdf_object_unittest.cpp
+++ b/core/fpdfapi/fpdf_parser/cpdf_object_unittest.cpp
@@ -25,6 +25,7 @@ namespace {
using ScopedArray = std::unique_ptr<CPDF_Array, ReleaseDeleter<CPDF_Array>>;
using ScopedDict =
std::unique_ptr<CPDF_Dictionary, ReleaseDeleter<CPDF_Dictionary>>;
+using ScopedStream = std::unique_ptr<CPDF_Stream, ReleaseDeleter<CPDF_Stream>>;
void TestArrayAccessors(const CPDF_Array* arr,
size_t index,
@@ -95,8 +96,10 @@ class PDFObjectsTest : public testing::Test {
// Indirect references to indirect objects.
m_ObjHolder.reset(new CPDF_IndirectObjectHolder());
- m_IndirectObjs = {boolean_true_obj, number_int_obj, str_spec_obj, name_obj,
- m_ArrayObj, m_DictObj, stream_obj};
+ m_IndirectObjs = {boolean_true_obj->Clone(), number_int_obj->Clone(),
+ str_spec_obj->Clone(), name_obj->Clone(),
+ m_ArrayObj->Clone(), m_DictObj->Clone(),
+ stream_obj->Clone()};
for (size_t i = 0; i < m_IndirectObjs.size(); ++i) {
m_ObjHolder->AddIndirectObject(m_IndirectObjs[i]);
m_RefObjs.emplace_back(new CPDF_Reference(
@@ -104,7 +107,7 @@ class PDFObjectsTest : public testing::Test {
}
}
- bool Equal(CPDF_Object* obj1, CPDF_Object* obj2) {
+ bool Equal(const CPDF_Object* obj1, const CPDF_Object* obj2) {
if (obj1 == obj2)
return true;
if (!obj1 || !obj2 || obj1->GetType() != obj2->GetType())
@@ -253,7 +256,7 @@ TEST_F(PDFObjectsTest, GetDict) {
const CPDF_Dictionary* const indirect_obj_results[] = {
nullptr, nullptr, nullptr, nullptr, nullptr, m_DictObj, m_StreamDictObj};
for (size_t i = 0; i < m_RefObjs.size(); ++i)
- EXPECT_EQ(indirect_obj_results[i], m_RefObjs[i]->GetDict());
+ EXPECT_TRUE(Equal(indirect_obj_results[i], m_RefObjs[i]->GetDict()));
}
TEST_F(PDFObjectsTest, GetArray) {
@@ -787,10 +790,9 @@ TEST(PDFDictionaryTest, CloneDirectObject) {
TEST(PDFObjectTest, CloneCheckLoop) {
{
- // Create an object with a reference loop.
- ScopedArray arr_obj(new CPDF_Array);
- // Dictionary object.
+ // Create a dictionary/array pair with a reference loop.
CPDF_Dictionary* dict_obj = new CPDF_Dictionary();
+ ScopedArray arr_obj(new CPDF_Array);
dict_obj->SetFor("arr", arr_obj.get());
arr_obj->InsertAt(0, dict_obj);
@@ -806,6 +808,22 @@ TEST(PDFObjectTest, CloneCheckLoop) {
EXPECT_EQ(nullptr, cloned_dict->AsDictionary()->GetObjectFor("arr"));
}
{
+ // Create a dictionary/stream pair with a reference loop.
+ CPDF_Dictionary* dict_obj = new CPDF_Dictionary();
+ ScopedStream stream_obj(new CPDF_Stream(nullptr, 0, dict_obj));
+ dict_obj->SetFor("stream", stream_obj.get());
+
+ // Clone this object to see whether stack overflow will be triggered.
+ ScopedStream cloned_stream(stream_obj->Clone()->AsStream());
+ // Cloned object should be the same as the original.
+ ASSERT_TRUE(cloned_stream);
+ CPDF_Object* cloned_dict = cloned_stream->GetDict();
+ ASSERT_TRUE(cloned_dict);
+ ASSERT_TRUE(cloned_dict->IsDictionary());
+ // Recursively referenced object is not cloned.
+ EXPECT_EQ(nullptr, cloned_dict->AsDictionary()->GetObjectFor("stream"));
+ }
+ {
CPDF_IndirectObjectHolder objects_holder;
// Create an object with a reference loop.
CPDF_Dictionary* dict_obj = new CPDF_Dictionary();
diff --git a/core/fpdfapi/fpdf_parser/cpdf_parser.cpp b/core/fpdfapi/fpdf_parser/cpdf_parser.cpp
index 182d3869bc..bc3dfe6021 100644
--- a/core/fpdfapi/fpdf_parser/cpdf_parser.cpp
+++ b/core/fpdfapi/fpdf_parser/cpdf_parser.cpp
@@ -956,36 +956,34 @@ FX_BOOL CPDF_Parser::RebuildCrossRef() {
}
FX_BOOL CPDF_Parser::LoadCrossRefV5(FX_FILESIZE* pos, FX_BOOL bMainXRef) {
- CPDF_Object* pObject = ParseIndirectObjectAt(m_pDocument, *pos, 0);
+ std::unique_ptr<CPDF_Object> pObject(
+ ParseIndirectObjectAt(m_pDocument, *pos, 0));
if (!pObject)
return FALSE;
+ CPDF_Object* pUnownedObject = pObject.get();
+
if (m_pDocument) {
CPDF_Dictionary* pRootDict = m_pDocument->GetRoot();
- if (pRootDict && pRootDict->GetObjNum() == pObject->m_ObjNum) {
- // If |pObject| has an objnum assigned then this will leak as Release()
- // will early exit.
- if (pObject->IsStream())
- pObject->Release();
+ if (pRootDict && pRootDict->GetObjNum() == pObject->m_ObjNum)
return FALSE;
- }
- if (!m_pDocument->ReplaceIndirectObjectIfHigherGeneration(pObject->m_ObjNum,
- pObject)) {
+ // Takes ownership of object (std::move someday).
+ uint32_t objnum = pObject->m_ObjNum;
+ if (!m_pDocument->ReplaceIndirectObjectIfHigherGeneration(
+ objnum, pObject.release())) {
return FALSE;
}
}
- CPDF_Stream* pStream = pObject->AsStream();
+ CPDF_Stream* pStream = pUnownedObject->AsStream();
if (!pStream)
return FALSE;
CPDF_Dictionary* pDict = pStream->GetDict();
*pos = pDict->GetIntegerFor("Prev");
int32_t size = pDict->GetIntegerFor("Size");
- if (size < 0) {
- pStream->Release();
+ if (size < 0)
return FALSE;
- }
CPDF_Dictionary* pNewTrailer = ToDictionary(pDict->Clone());
if (bMainXRef) {
@@ -1017,10 +1015,8 @@ FX_BOOL CPDF_Parser::LoadCrossRefV5(FX_FILESIZE* pos, FX_BOOL bMainXRef) {
arrIndex.push_back(std::make_pair(0, size));
pArray = pDict->GetArrayFor("W");
- if (!pArray) {
- pStream->Release();
+ if (!pArray)
return FALSE;
- }
CFX_ArrayTemplate<uint32_t> WidthArray;
FX_SAFE_UINT32 dwAccWidth = 0;
@@ -1029,10 +1025,8 @@ FX_BOOL CPDF_Parser::LoadCrossRefV5(FX_FILESIZE* pos, FX_BOOL bMainXRef) {
dwAccWidth += WidthArray[i];
}
- if (!dwAccWidth.IsValid() || WidthArray.GetSize() < 3) {
- pStream->Release();
+ if (!dwAccWidth.IsValid() || WidthArray.GetSize() < 3)
return FALSE;
- }
uint32_t totalWidth = dwAccWidth.ValueOrDie();
CPDF_StreamAcc acc;
@@ -1092,17 +1086,14 @@ FX_BOOL CPDF_Parser::LoadCrossRefV5(FX_FILESIZE* pos, FX_BOOL bMainXRef) {
if (type == 1) {
m_SortedOffset.insert(offset);
} else {
- if (offset < 0 || !IsValidObjectNumber(offset)) {
- pStream->Release();
+ if (offset < 0 || !IsValidObjectNumber(offset))
return FALSE;
- }
m_ObjectInfo[offset].type = 255;
}
}
}
segindex += count;
}
- pStream->Release();
return TRUE;
}
diff --git a/core/fpdfapi/fpdf_parser/cpdf_stream.cpp b/core/fpdfapi/fpdf_parser/cpdf_stream.cpp
index 4f6d046397..6a0bf05937 100644
--- a/core/fpdfapi/fpdf_parser/cpdf_stream.cpp
+++ b/core/fpdfapi/fpdf_parser/cpdf_stream.cpp
@@ -19,7 +19,11 @@ CPDF_Stream::CPDF_Stream(uint8_t* pData, uint32_t size, CPDF_Dictionary* pDict)
m_dwSize(size),
m_pDataBuf(pData) {}
-CPDF_Stream::~CPDF_Stream() {}
+CPDF_Stream::~CPDF_Stream() {
+ m_ObjNum = kInvalidObjNum;
+ if (m_pDict && m_pDict->GetObjNum() == kInvalidObjNum)
+ m_pDict.release(); // lowercase release, release ownership.
+}
CPDF_Object::Type CPDF_Stream::GetType() const {
return STREAM;
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-05 07:41:40 +0000