[Octave-bug-tracker] [bug #47468] ones() is able to create array with number of elements above sizemax

[Carnë Draug]

URL:
  <http://savannah.gnu.org/bugs/?47468>

                 Summary: ones() is able to create array with number of
elements above sizemax
                 Project: GNU Octave
            Submitted by: carandraug
            Submitted on: Sat 19 Mar 2016 19:04:24 GMT
                Category: Libraries
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: None
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: GNU/Linux

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Details:

The functions ones() is able to create an array with more elements than it
should.

The problem is probably on input check. It is able to create an array with one
element above sizemax (I will report a separate bug for the limit of sizemax
which is one below the numeric limit of int32).


octave> uint64 (numel (ones (1, sizemax ())))
ans = 2147483646
octave> uint64 (numel (ones (1, sizemax () +1)))
ans = 2147483647
octave> uint64 (numel (ones (1, sizemax () +10)))
ans = 2147483647


Interestingly, this only works when sizemax is the number of columns:


octave> uint64 (numel (ones (sizemax () +1, 1)))
error: out of memory or dimension too large for Octave's index type
octave> uint64 (numel (ones (1, 1, sizemax () +1)))
error: out of memory or dimension too large for Octave's index type


zeros () is more sensitive the other way and even fails when creating an array
with numel == sizemax:


octave> uint64 (numel (zeros (1, sizemax ())))
error: out of memory or dimension too large for Octave's index type
octave> uint64 (numel (zeros (sizemax (), 1)))
error: out of memory or dimension too large for Octave's index type


and even for less elements than sizemax():


octave> uint64 (numel (zeros (sizemax ()-1, 1)))
error: out of memory or dimension too large for Octave's index type





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