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Message-ID: <9ba7ba75043cdabf30bc98260848aa8b9e43c0bd.camel@gmail.com>
Date: Thu, 08 Jan 2026 15:59:22 +0100
From: Martin Uecker <ma.uecker@...il.com>
To: Joseph Myers <josmyers@...hat.com>, Alejandro Colomar
<une+c@...jandro-colomar.es>
Cc: David Svoboda <svoboda@...t.org>, Robert Seacord <rcseacord@...il.com>,
"sc22wg14@...n-std. org" <sc22wg14@...n-std.org>, Florian Weimer
<fweimer@...hat.com>, Carlos O'Donell <carlos@...hat.com>, Aaron Ballman
<aaron@...onballman.com>, "libc-alpha@...rceware.org"
<libc-alpha@...rceware.org>, "musl@...ts.openwall.com"
<musl@...ts.openwall.com>, "linux-man@...r.kernel.org"
<linux-man@...r.kernel.org>
Subject: Re: [SC22WG14.34679] n3752, alx-0029r8 - Restore the traditional
realloc(3) specification
Am Mittwoch, dem 07.01.2026 um 22:01 +0000 schrieb Joseph Myers:
> On Wed, 7 Jan 2026, Alejandro Colomar wrote:
>
> > I thought you were talking about the UB introduced in C23, but that one
> > seems not documented in Annex J. In fact, it's still documented
> > incorrectly as ID (J.3.13 entry 41, in N3220).
>
> See
> https://stackoverflow.com/questions/78691087/reallocptr-0-in-c23-now-what
> regarding the lists of UB related to realloc being out of date. I think
> this could be fixed editorially via a merge request (to make the Annex J
> lists in C2y agree with the actual current realloc semantics in C2y) but I
> haven't got round to writing such an MR myself.
There know of various other issues and omissions in Annex J3. I think
it would be good if the UB study group informally takes over maintenance
of this annex.
Martin
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