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Posted to dev@pdfbox.apache.org by "Andreas Lehmkühler (JIRA)" <ji...@apache.org> on 2018/12/02 17:09:00 UTC
[jira] [Closed] (PDFBOX-4131) Stack overflow in fields
[ https://issues.apache.org/jira/browse/PDFBOX-4131?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Andreas Lehmkühler closed PDFBOX-4131.
--------------------------------------
> Stack overflow in fields
> ------------------------
>
> Key: PDFBOX-4131
> URL: https://issues.apache.org/jira/browse/PDFBOX-4131
> Project: PDFBox
> Issue Type: Bug
> Components: AcroForm
> Affects Versions: 2.0.8
> Reporter: Maison
> Priority: Major
> Fix For: 2.0.9, 3.0.0 PDFBox
>
> Attachments: fields_loop_kid_is_parent.pdf, fields_loop_kid_is_parent_of_other_group.pdf
>
>
> Note: unfortunately I can not attach original file for confidentiality reasons
> I have a pdf containing some fields :
>
> /AcroForm 2 0 R
> ...
> 2 0 obj
> <<
> /DR 5 0 R
> /Fields [ ... 15 0 R 16 0 R 17 0 R ...]
> >>
> and then for field object 17 :
> 17 0 obj
> <<
> /DA (/Helv 8 Tf 0 g)
> /FT /Tx
> /Ff 1
> /Kids [17 0 R 88 0 R 89 0 R]
> /MaxLen 0
> /T (Nom)
> >>
> Here we see that this field is contained in its children list : this triggers a recursivity loop during parsing (or at least during method call getAcroForm() )
> at java.lang.StringBuilder.toString(StringBuilder.java:407)
> at org.apache.pdfbox.cos.PDFDocEncoding.toString(PDFDocEncoding.java:135)
> at org.apache.pdfbox.cos.COSString.getString(COSString.java:203)
> at org.apache.pdfbox.cos.COSDictionary.getString(COSDictionary.java:670)
> at org.apache.pdfbox.pdmodel.interactive.form.PDFieldFactory.createField(PDFieldFactory.java:64)
> at org.apache.pdfbox.pdmodel.interactive.form.PDField.fromDictionary(PDField.java:80)
> at org.apache.pdfbox.pdmodel.interactive.form.PDNonTerminalField.getChildren(PDNonTerminalField.java:139)
> at org.apache.pdfbox.pdmodel.interactive.form.PDFieldTree$FieldIterator.enqueueKids(PDFieldTree.java:99)
> at org.apache.pdfbox.pdmodel.interactive.form.PDFieldTree$FieldIterator.enqueueKids(PDFieldTree.java:102)
> ...
>
> I use pdfbox 2.0.8
> Similar problem with preflight parser.
> In this case a simple fix would be to ignore children fields that are the same as their parent ; however the references loop may be much more complicated.
>
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