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From "Christopher Berner (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MATH-679) Integer overflow in OpenMapRealMatrix
Date Mon, 03 Oct 2011 05:37:34 GMT

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

Christopher Berner updated MATH-679:
------------------------------------

    Attachment: Flaw.java
    
> 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
>         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 code below 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.
> import org.apache.commons.math.linear.OpenMapRealMatrix;
> public class Flaw {
> 	public static void main(String[] args) {
> 		OpenMapRealMatrix m = new OpenMapRealMatrix(3, Integer.MAX_VALUE);
> 		m.setEntry(0, 0, 2);
> 		m.setEntry(2, 2, 3);
> 		//Should print "2.0", but instead it prints "3.0"
> 		System.out.println(m.getEntry(0, 0));
> 	}
> }

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