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In QPDF::filterCompressedObjects ignore objects not in QPDFWriter tables

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Add fuzz case 68377.
This commit is contained in:
m-holger 2024-04-30 10:46:06 +01:00
parent 972cbf103d
commit 60c7d594b8
5 changed files with 22 additions and 11 deletions
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1
fuzz/CMakeLists.txt
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@ -114,6 +114,7 @@ set(CORPUS_OTHER
65681.fuzz
65773.fuzz
65777.fuzz
68377.fuzz
)
set(CORPUS_DIR ${CMAKE_CURRENT_BINARY_DIR}/qpdf_corpus)

BIN
fuzz/qpdf_extra/68377.fuzz Normal file
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2
fuzz/qtest/fuzz.test
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@ -21,7 +21,7 @@ my @fuzzers = (
['pngpredictor' => 1],
['runlength' => 6],
['tiffpredictor' => 2],
['qpdf' => 56], # increment when adding new files
['qpdf' => 57], # increment when adding new files
);
my $n_tests = 0;

24
libqpdf/QPDF_optimization.cc
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@ -416,22 +416,26 @@ QPDF::filterCompressedObjects(QPDFWriter::ObjTable const& obj)
ObjUser const& ou = i1.first;
// Loop over objects.
for (auto const& og: i1.second) {
if (auto const& i2 = obj[og].object_stream; i2 <= 0) {
t_obj_user_to_objects[ou].insert(og);
} else {
t_obj_user_to_objects[ou].insert(QPDFObjGen(i2, 0));
if (obj.contains(og)) {
if (auto const& i2 = obj[og].object_stream; i2 <= 0) {
t_obj_user_to_objects[ou].insert(og);
} else {
t_obj_user_to_objects[ou].insert(QPDFObjGen(i2, 0));
}
}
}
}
for (auto const& i1: m->object_to_obj_users) {
QPDFObjGen const& og = i1.first;
// Loop over obj_users.
for (auto const& ou: i1.second) {
if (auto i2 = obj[og].object_stream; i2 <= 0) {
t_object_to_obj_users[og].insert(ou);
} else {
t_object_to_obj_users[QPDFObjGen(i2, 0)].insert(ou);
if (obj.contains(og)) {
// Loop over obj_users.
for (auto const& ou: i1.second) {
if (auto i2 = obj[og].object_stream; i2 <= 0) {
t_object_to_obj_users[og].insert(ou);
} else {
t_object_to_obj_users[QPDFObjGen(i2, 0)].insert(ou);
}
}
}
}

6
libqpdf/qpdf/ObjTable.hh
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@ -62,6 +62,12 @@ class ObjTable: public std::vector<T>
return idx < std::vector<T>::size() || sparse_elements.count(idx);
}
inline bool
contains(QPDFObjGen og) const
{
return contains(static_cast<size_t>(og.getObj()));
}
inline bool
contains(QPDFObjectHandle oh) const
{