| From: | Alexander Korotkov <aekorotkov(at)gmail(dot)com> |
|---|---|
| To: | Alexander Lakhin <exclusion(at)gmail(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, pgsql-bugs(at)lists(dot)postgresql(dot)org |
| Subject: | Re: BUG #17847: Unaligned memory access in ltree_gist |
| Date: | 2023-03-19 17:09:27 |
| Message-ID: | CAPpHfdt4bXSjXqsPZwQcTXVvzpPwYxPLGR=9ZDiQ=6vaSkYF1A@mail.gmail.com |
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| Lists: | pgsql-bugs |
On Sat, Mar 18, 2023 at 10:00 AM Alexander Lakhin <exclusion(at)gmail(dot)com> wrote:
> 16.03.2023 22:35, Tom Lane wrote:
>
> I wonder which other opclasses besides ltree have the same issue.
>
>
> I found no other similar places: siglen is also accepted by opclasses
> gist__intbig_ops, gist_hstore_ops, gist_trgm_ops, tsvector_ops,
> which implementations use functions
> _intbig_alloc, ghstore_alloc, gtrgm_alloc, gtsvector_alloc,
> and none of them adds siglen to a pointer.
> Quick testing confirms that.
>
> (gist__ltree_ops uses ltree_gist_alloc(), but the problematic branch
> "if (left) ..." not reached for gist__ltree_ops)
Yep, ltree seems the only place storing aligned value *after*
signature. Thank you for validating this.
------
Regards,
Alexander Korotkov
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