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Re: Problem with setlocale (found in libecpg) [accessing a

From: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
To: Christof Petig <christof(at)petig-baender(dot)de>
Cc: Michael Meskes <meskes(at)postgresql(dot)org>, pgsql-patches(at)postgresql(dot)org
Subject: Re: Problem with setlocale (found in libecpg) [accessing a
Date: 2001-09-26 20:22:06
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Lists: pgsql-hackerspgsql-patches
Your patch has been added to the PostgreSQL unapplied patches list at:

I will try to apply it within the next 48 hours.

> Hello,
> well at first I could not believe what I was seeing ...
> Look at the following code (ecpg/lib/execute.c):
>    const char *locale=setlocale(LC_NUMERIC, NULL);
>    setlocale(LC_NUMERIC, "C");
> [....]
>    setlocale(LC_NUMERIC, locale);
> Well at least on glibc-2.2 it seems that setlocale retuns a pointer to
> malloced memory, and frees this pointer on subsequent calls to
> setlocale. This is standard conformant and has good reasons. But used as
> above it is lethal (but not lethal enough to be easily recognized). So
> the content locale points to is freed by the second call to setlocale.
> The remedy is easy (given that _no other_ call to setlocale happens
> inbetween ...)
>    const char *locale=setlocale(LC_NUMERIC, "C");
>    [...]
>    setlocale(LC_NUMERIC, locale);
> So I would kindly ask you to take a second look at every invokation of
> setlocale. And to apply the following patch.
> Yours
>     Christof

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  Bruce Momjian                        |
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