#14501: Fix memory allocation problems in data_structures_pyx.pxi
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Reporter: dcoudert | Owner: joyner
Type: defect | Status: needs_review
Priority: major | Milestone: sage-5.10
Component: group theory | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers:
Authors: David Coudert | Merged in:
Dependencies: | Stopgaps:
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Comment (by ncohen):
> Proof: With malloc, C allocates a contiguous segment of memory. However,
this block ''is not initialized''! type "man malloc" in your terminal of
go to http://man7.org/linux/man-pages/man3/malloc.3.html.
> With calloc, the memory is initialized to 0 or NULL. \qed
I know. That's what I meant when I said that it is useless unless proven
otherwise.
In the case at hand, 10 lines after the malloc that you relaced with a
calloc the whole vector is overwritten with data that makes sense,
contrary to 0s.
Nathann
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14501#comment:5>
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