[Octave-bug-tracker] [bug #56232] Octave crash when inverting an empty sparse matrix.

[Marco Caliari]

Follow-up Comment #26, bug #56232 (project octave):

@Rik: the change to Ai should be applied, in case, also around line 686 of
sparse-lu. But then octave segfaults. Could it be that Ax has to be different
from nullptr, too? I found in umfpack documentation


However, nz can be zero, since all singular matrices are
handled correctly. If you attempt to malloc an array of size nz = 0, however,
malloc will return
a null pointer which UMFPACK will report as a missing argument. If you malloc
an array of size
nz to pass to UMFPACK, make sure that you handle the nz = 0 case correctly
(use a size equal to
the maximum of nz and 1, or use a size of nz+1).


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