Is this a memory leak? (Math::Factor::XS)

I am just looking at someone else's code here:

https://github.com/benkasminbullock/Math-Factor-XS/blob/master/XS.xs#L41

From the recent discussion on this list, I get the impression that is a
memory leak of "factors". Is that a correct understanding? Should I report
this as a bug?

Also, what is the test module for XS memory leaks on objects created via
newAV, newHV?