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Code Issues Releases Wiki Activity

Tighten checks for invalid indirect references in QPDFParser

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This commit is contained in:
m-holger 2024-01-17 13:15:13 +00:00
parent 6e3b7982db
commit ed43691bf3
3 changed files with 10 additions and 7 deletions
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11
libqpdf/QPDFParser.cc
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@ -163,16 +163,15 @@ QPDFParser::parseRemainder(bool content_stream)
throw std::logic_error("QPDFParser::parse called without context on an object "
"with indirect references");
}
auto ref_og = QPDFObjGen(
QIntC::to_int(int_buffer[(int_count - 1) % 2]),
QIntC::to_int(int_buffer[(int_count) % 2]));
if (ref_og.isIndirect()) {
auto id = QIntC::to_int(int_buffer[(int_count - 1) % 2]);
auto gen = QIntC::to_int(int_buffer[(int_count) % 2]);
if (!(id < 1 || gen < 0 || gen >= 65535)) {
// This action has the desirable side effect of causing dangling references
// (references to indirect objects that don't appear in the PDF) in any parsed
// object to appear in the object cache.
add(std::move(context->getObject(ref_og).obj));
add(std::move(context->getObject(id, gen).obj));
} else {
QTC::TC("qpdf", "QPDFParser indirect with 0 objid");
QTC::TC("qpdf", "QPDFParser invalid objgen");
addNull();
}
int_count = 0;

2
qpdf/qpdf.testcov
View File

@ -256,7 +256,7 @@ QPDFWriter standard deterministic ID 1
QPDFWriter linearized deterministic ID 1
QPDFWriter deterministic with no data 0
qpdf-c called qpdf_set_deterministic_ID 0
QPDFParser indirect with 0 objid 0
QPDFParser invalid objgen 0
QPDF object id 0 0
QPDF recursion loop in resolve 0
QPDFParser treat word as string 0

4
qpdf/test_driver.cc
View File

@ -1202,6 +1202,10 @@ test_31(QPDF& pdf, char const* arg2)
assert(QPDFObjectHandle::parse(&pdf, ">>").unparse() == "null");
// TC:QPDFParser eof in parse
assert(QPDFObjectHandle::parse(&pdf, "[7 0 R]").getArrayItem(0).isNull());
// TC:QPDFParser invalid objgen
assert(
QPDFObjectHandle::parse(&pdf, "[0 0 R -1 0 R 1 65535 R 1 100000 R 1 -1 R]").unparse() ==
"[ null null null null null ]");
}
static void