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Merge pull request #1128 from m-holger/reconstruct

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Tighten checks for invalid indirect references  during xref reconstru…
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Jay Berkenbilt 2024-01-20 12:43:07 -05:00 committed by GitHub
commit 4660e23262
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3 changed files with 5 additions and 1 deletions
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4
libqpdf/QPDF.cc
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@ -1195,6 +1195,10 @@ QPDF::insertFreeXrefEntry(QPDFObjGen og)
void
QPDF::insertReconstructedXrefEntry(int obj, qpdf_offset_t f1, int f2)
{
if (!(obj > 0 && 0 <= f2 && f2 < 65535)) {
QTC::TC("qpdf", "QPDF xref overwrite invalid objgen");
return;
}
QPDFObjGen og(obj, f2);
if (!m->deleted_objects.count(obj)) {
// deleted_objects stores the uncompressed objects removed from the xref table at the start

1
qpdf/qpdf.testcov
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@ -105,6 +105,7 @@ QPDF_encryption xref stream from encrypted file 0
QPDFJob unable to filter 0
QUtil non-trivial UTF-16 0
QPDF xref overwrite object 0
QPDF xref overwrite invalid objgen 0
QPDF decoding error warning 0
qpdf-c called qpdf_init 0
qpdf-c called qpdf_cleanup 0

1
qpdf/qtest/qpdf/obj0-check.out
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@ -5,5 +5,4 @@ checking obj0.pdf
PDF Version: 1.3
File is not encrypted
File is not linearized
WARNING: obj0.pdf (offset 15): object with ID 0
qpdf: operation succeeded with warnings