Re: BUG #17847: Unaligned memory access in ltree_gist

From: Alexander Lakhin <exclusion(at)gmail(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: pgsql-bugs(at)lists(dot)postgresql(dot)org, Alexander Korotkov <aekorotkov(at)gmail(dot)com>
Subject: Re: BUG #17847: Unaligned memory access in ltree_gist
Date: 2023-03-18 07:00:01
Message-ID: f9591c60-b241-5f03-711d-171ded31650a@gmail.com
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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)

Best regards,
Alexander

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