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