out-of-bound write

[Niels Möller]

Vincent Lefevre <vincent at vinc17.net> writes:

> It took me some time to understand that, i.e. that in addition to
> valid limbs, other (invalid) limbs may also be written. I wonder
> what the other users think about that...

At least it's not unique to mpn_set_str. mpn_gcd also have require space
for an extra limb for the cofactor output (also related to mpn_mul api),
and earlier versions also required an extra limb for the (destroyed)
inputs(!).

Regards,
/Niels

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