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From: Pirmin Walthert <pirmin.walthert@wwcom.ch>
To: musl@lists.openwall.com
Subject: Re: gethostbyname2.c / 6476b8135760659b25c93ff9308425ca98a9e777 breaking asterisk 13 compatibility
Date: Thu, 24 Aug 2017 15:02:28 +0200	[thread overview]
Message-ID: <1503579748.12219.23.camel@wwcom.ch> (raw)
In-Reply-To: <B1724849-3441-4BF2-9671-87B694D541BD@shiz.me>

Am Donnerstag, den 24.08.2017, 14:47 +0200 schrieb Shiz:
> > > Second: I'm currently debugging a strange memory corruption
> > > problem
> > > and
> > > have just had a look at the gethostbyname2.c code:
> > > 
> > > I was wondering: why is it safe to do free(h) on the initial run
> > > when
> > > *h has not been
> > > 
> > >        static struct hostent *h;
> > >        size_t size = 63;
> > >        struct hostent *res;
> > >        int err;
> > >        do {
> > >                free(h);
> > > 
> > > Best regards,
> > > 
> > > Pirmin
> 
> h is defined as having static storage, as such its initial
> value is NULL. free(NULL) is valid.
> 
> - Shiz

You're right, thanks for pointing that out.


  reply	other threads:[~2017-08-24 13:02 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-08-24 11:39 Pirmin Walthert
2017-08-24 11:40 ` Pirmin Walthert
2017-08-24 12:47   ` Shiz
2017-08-24 13:02     ` Pirmin Walthert [this message]
2017-08-24 12:58 ` Timo Teras
2017-08-24 13:09   ` Pirmin Walthert
2017-08-24 16:17 ` Rich Felker
2017-08-24 16:24   ` Pirmin Walthert

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