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From "Simon Willnauer (JIRA)" <>
Subject [jira] [Updated] (LUCENE-4074) FST Sorter BufferSize causes int overflow if BufferSize > 2048MB
Date Wed, 23 May 2012 15:56:41 GMT


Simon Willnauer updated LUCENE-4074:

    Attachment: LUCENE-4074.patch

here is a patch that adds a testcase, changes all arguments and constants to 64bit signed
ints and checks for negative values in the BufferSize ctor for immediate feedback.
> FST Sorter BufferSize causes int overflow if BufferSize > 2048MB
> ----------------------------------------------------------------
>                 Key: LUCENE-4074
>                 URL:
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: modules/spellchecker
>    Affects Versions: 3.6, 4.0
>            Reporter: Simon Willnauer
>             Fix For: 3.6.1, 4.1
>         Attachments: LUCENE-4074.patch
> the BufferSize constructor accepts size in MB as an integer and uses multiplication to
convert to bytes. While its checking the size in bytes to be less than 2048 MB it does that
after byte conversion. If you pass a value > 2047 to the ctor the value overflows since
all constants and methods based on MB expect 32 bit signed ints. This does not even result
in an exception until the BufferSize is actually passed to the sorter.

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