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https://issues.apache.org/jira/browse/LUCENE-4127?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Muir updated LUCENE-4127:
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Attachment: LUCENE-4127_offsetAtt.patch
Here's a patch adding the stateless checks to OffsetAttributeImpl. I think its
a good step, and tests pass.
> negative offsets/deltas corrumption
> -----------------------------------
>
> Key: LUCENE-4127
> URL: https://issues.apache.org/jira/browse/LUCENE-4127
> Project: Lucene - Java
> Issue Type: Bug
> Components: core/index
> Affects Versions: 4.0
> Reporter: Robert Muir
> Attachments: LUCENE-4127.patch, LUCENE-4127_offsetAtt.patch,
> LUCENE-4127_test.patch
>
>
> If offsets go negative or backwards, it can corrupt the index with
> DOCS_AND_FREQS_AND_POSITIONS_AND_OFFSETS: the offsets will have wrong values
> (different from the term vectors) or even crazy values like -2147483645
> The problem with this is that its not just theoretical: its too easy to do
> this with lucene's own analyzer chains (e.g. ngramtokenizer).
>
> See issues such as LUCENE-3920 and some discussion on LUCENE-3738
> The question is how to fix this, e.g. should we:
> # start enforcing that offsets cannot be crazy values in
> OffsetAttributeImpl/IndexWriter and fix the broken analyzers
> # leave offsets as a pair of opaque integers, declaring this a limitation of
> the current codec, and either workaround or throw UOE from the postings
> writer.
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