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Checks on stated byte lengths in xref stream objects. Closes #94.

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This commit is contained in:
Gunnsteinn Hall 2017-08-02 15:46:31 +00:00
parent 28aea0d8d7
commit 2ecf2acce5
1 changed files with 9 additions and 0 deletions
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9
pdf/core/parser.go
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@ -857,6 +857,15 @@ func (this *PdfParser) parseXrefStream(xstm *PdfObjectInteger) (*PdfObjectDictio
s2 := int(b[0] + b[1] + b[2]) s2 := int(b[0] + b[1] + b[2])
deltab := int(b[0] + b[1] + b[2]) deltab := int(b[0] + b[1] + b[2])
if s0 < 0 || s1 < 0 || s2 < 0 {
common.Log.Debug("Error s value < 0 (%d,%d,%d)", s0, s1, s2)
return nil, errors.New("Range check error")
}
if deltab == 0 {
common.Log.Debug("No xref objects in stream (deltab == 0)")
return trailerDict, nil
}
// Calculate expected entries. // Calculate expected entries.
entries := len(ds) / deltab entries := len(ds) / deltab