OpenSystemsDevelopment / qpdf

Commit ee44aef8d08d8f745380277412ec8bb420648a7c

Authored by Jay Berkenbilt
1 parent 6fe1e9de

Treat loop in xref tables as damage (fixes #192) 

Prior to this fix, if there was a loop detected in following /Prev
pointers in xref streams/tables, it would cause qpdf to lose data.
Note that this condition causes many PDF readers to hang or fail.
Inline Side-by-side
Showing 8 changed files with 1620 additions and 3 deletions
ChangeLog
  View file @ee44aef
  1 +2018-03-05 Jay Berkenbilt <ejb@ql.org>
  2 +
  3 + * Improve handling of loops while following cross reference
  4 + tables. Fixes #192.
  5 +
1 6 2018-03-04 Jay Berkenbilt <ejb@ql.org>
2 7  
3 8 * 8.0.1: release
... ...
libqpdf/QPDF.cc
  View file @ee44aef
... ... @@ -532,7 +532,9 @@ QPDF::read_xref(qpdf_offset_t xref_offset)
532 532 }
533 533 if (visited.count(xref_offset) != 0)
534 534 {
535   - xref_offset = 0;
  535 + QTC::TC("qpdf", "QPDF xref loop");
  536 + throw QPDFExc(qpdf_e_damaged_pdf, this->m->file->getName(), "", 0,
  537 + "loop detected following xref tables");
536 538 }
537 539 }
538 540  
... ...
qpdf/qpdf.testcov
  View file @ee44aef
... ... @@ -334,3 +334,4 @@ QPDFObjectHandle dictionary ignoring removereplace 0
334 334 QPDFObjectHandle numeric non-numeric 0
335 335 QPDFObjectHandle erase array bounds 0
336 336 qpdf-c called qpdf_check_pdf 0
  337 +QPDF xref loop 0
... ...
qpdf/qtest/qpdf.test
  View file @ee44aef
... ... @@ -1400,7 +1400,7 @@ $td-&gt;runtest(&quot;C API: no recovery&quot;,
1400 1400 show_ntests();
1401 1401 # ----------
1402 1402 $td->notify("--- Recovery Tests ---");
1403   -$n_tests += @badfiles + 7;
  1403 +$n_tests += @badfiles + 9;
1404 1404  
1405 1405 # Recovery tests. These are mostly after-the-fact -- when recovery
1406 1406 # was implemented, some degree of recovery was possible on many of the
... ... @@ -1469,6 +1469,17 @@ $td-&gt;runtest(&quot;recoverable xref errors&quot;,
1469 1469 $td->EXIT_STATUS => 3},
1470 1470 $td->NORMALIZE_NEWLINES);
1471 1471  
  1472 +$td->runtest("xref loop with append",
  1473 + {$td->COMMAND =>
  1474 + "qpdf --deterministic-id append-xref-loop.pdf a.pdf"},
  1475 + {$td->FILE => "append-xref-loop.out",
  1476 + $td->EXIT_STATUS => 3},
  1477 + $td->NORMALIZE_NEWLINES);
  1478 +
  1479 +$td->runtest("check output",
  1480 + {$td->FILE => "a.pdf"},
  1481 + {$td->FILE => "append-xref-loop-fixed.pdf"});
  1482 +
1472 1483 show_ntests();
1473 1484 # ----------
1474 1485 $td->notify("--- Basic Parsing Tests ---");
... ...
qpdf/qtest/qpdf/append-xref-loop-fixed.pdf 0 → 100644
View file @ee44aef
No preview for this file type
qpdf/qtest/qpdf/append-xref-loop.out 0 → 100644
  View file @ee44aef
  1 +WARNING: append-xref-loop.pdf: file is damaged
  2 +WARNING: append-xref-loop.pdf: loop detected following xref tables
  3 +WARNING: append-xref-loop.pdf: Attempting to reconstruct cross-reference table
  4 +qpdf: operation succeeded with warnings; resulting file may have some problems
... ...
qpdf/qtest/qpdf/append-xref-loop.pdf 0 → 100644
  View file @ee44aef
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... ...