STINNER Victor <vstin...@python.org> added the comment:

>  n++; // Avoid malloc(0)
> grouplist = PyMem_New(gid_t, n+1);

FYI PyMem_New(0) is well specified and doesn't return NULL:
https://docs.python.org/dev/c-api/memory.html#c.PyMem_Malloc

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nosy: +vstinner

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue46606>
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