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