GNU bug report logs - #79156
igc: igc_xpalloc_ambig SEGV

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From: Gerd Möllmann <gerd.moellmann <at> gmail.com>
To: Pip Cet <pipcet <at> protonmail.com>
Cc: Eli Zaretskii <eliz <at> gnu.org>, eller.helmut <at> gmail.com, 79156 <at> debbugs.gnu.org
Subject: bug#79156: igc: igc_xpalloc_ambig SEGV
Date: Sat, 02 Aug 2025 19:30:40 +0200

Pip Cet <pipcet <at> protonmail.com> writes:

> Gerd Möllmann <gerd.moellmann <at> gmail.com> writes:
>
>> Eli Zaretskii <eliz <at> gnu.org> writes:
>>
>>>> Ouch. That seems to me to be a bug in how charset.c calls xpalloc, but
>>>> I'm not sure whether there are other callers that rely on this behavior,
>>>> so it's safest to work around it.
>>>
>>> xpalloc handles this case:
>>>
>>>   if (! pa)
>>>     *nitems = 0;
>>
>> Yeah, I'd rather check the other igc variants of xpalloc, to make sure
>> they are compatible with the original, even if no one else uses that
>> particular feature.
>
> That's what I did, I think?
>
> The code above doesn't have any effect unless we run out of memory (even
> then, it won't have an effect if NITEMS is a stack variable in a frame
> that's unwound by memory_full).

Sorry, I'm currently to unconcentrated to follow. I just wanted to say
that it would be good to make the functions are compatible with xpalloc,
whatever that means.

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