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From "Luc Maisonobe (Resolved) (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (MATH-679) Integer overflow in OpenMapRealMatrix
Date Mon, 10 Oct 2011 19:58:29 GMT

     [ https://issues.apache.org/jira/browse/MATH-679?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Luc Maisonobe resolved MATH-679.
--------------------------------

       Resolution: Fixed
    Fix Version/s: 3.0

Fixed in subversion repository as of r1181181.

Thanks for the report and the workaround.
                
> Integer overflow in OpenMapRealMatrix
> -------------------------------------
>
>                 Key: MATH-679
>                 URL: https://issues.apache.org/jira/browse/MATH-679
>             Project: Commons Math
>          Issue Type: Bug
>    Affects Versions: 2.2
>            Reporter: Christopher Berner
>            Priority: Minor
>             Fix For: 3.0
>
>         Attachments: Flaw.java
>
>
> computeKey() has an integer overflow. Since it is a sparse matrix, this is quite easily
encountered long before heap space is exhausted. The attached code demonstrates the problem,
which could potentially be a security vulnerability (for example, if one was to use this matrix
to store access control information).
> Workaround: never create an OpenMapRealMatrix with more cells than are addressable with
an int.

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