Re: Avoid overflow with simplehash

Em qui., 6 de jul. de 2023 às 12:00, Daniel Gustafsson <daniel@yesql.se>
escreveu:

> > On 6 Jul 2023, at 16:42, Ranier Vilela <ranier.vf@gmail.com> wrote:
> > Em qui., 6 de jul. de 2023 às 11:37, Daniel Gustafsson <daniel@yesql.se
> <mailto:daniel@yesql.se>> escreveu:
>
> > #define SH_MAX_SIZE (((uint64) PG_UINT32_MAX) + 1)
> > This is Assert, that is, in production this test is not done.
>
> Correct, which implies that it's a test for something which is deemed
> highly
> unlikely to happen in production.
>
 Highly improbable does not mean impossible, or that it will never happen.


> > If the empty element is not found, startelem has PG_UINT64_MAX value,
> > which do not fit in uint32.
>
> Can you show an example where the hash isn't grown automatically to
> accomodate
> this such that the assertion is tripped?
>
A demo won't change the fact that the function can fail, even if it isn't
currently failing.
As a precaution to avoid future bugs, I think it's necessary to apply the
patch to increase the robustness of the function.

regards,
Ranier Vilela