Re: Non-replayable WAL records through overflows and >MaxAllocSize lengths

On Fri, 7 Apr 2023, 01:35 Michael Paquier, <michael(at)paquier(dot)xyz> wrote:

> On Fri, Apr 07, 2023 at 08:08:34AM +0900, Michael Paquier wrote:
> > So bumping mainrdata_len to uint64 is actually not entirely in line
> > with this code. Well, it will work because we'd still fail a couple
> > of lines down, but perhaps its readability should be improved so as
> > we have an extra check in this code path to make sure that
> > mainrdata_len is not higher than PG_UINT32_MAX, then use an
> > intermediate casted variable before saving the length in the record
> > data to make clear that the type of the main static length in
> > xloginsert.c is not the same as what a record has? The v10 I sent
> > previously blocked this possibility, but not v11.
>

Yes, that was a bad oversight, which would've shown up in tests on a system
with an endianness that my computer doesn't have...

> So, I was thinking about something like the attached tweaking this
> point, the error details a bit, applying an indentation and writing a
> commit message... Matthias?
>

That looks fine to me. Thanks for picking this up and fixing the issue.

Kind regards,

Matthias van de Meent