linux-kernel - Re: [PATCH 07/10] perf sort: Check return value of strdup()

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Message-ID: <20130116183855.GQ5826@ghostprotocols.net>
Date:	Wed, 16 Jan 2013 15:38:55 -0300
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>, Jiri Olsa <jolsa@...hat.com>,
	Namhyung Kim <namhyung.kim@....com>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 07/10] perf sort: Check return value of strdup()

Em Sun, Jan 13, 2013 at 05:43:37PM +0900, Namhyung Kim escreveu:
> Hi Arnaldo,
> 
> 2013-01-11 (금), 02:17 -0300, Arnaldo Carvalho de Melo:
> > Em Thu, Dec 27, 2012 at 06:11:44PM +0900, Namhyung Kim escreveu:
> > > From: Namhyung Kim <namhyung.kim@....com>
> > > 
> > > When setup_sorting() is called, 'str' is passed to strtok_r() but it's
> > > not checked to have a valid pointer.  As strtok_r() accepts NULL
> > > pointer on a first argument and use the third argument in that case,
> > > it can cause a trouble since our third argument, tmp, is not
> > > initialized.
> > 
> > Ok, but calling exit from here? Better to check it at the callers and
> > propagate the error, letting things like TUI/gui exit routines to
> > execute.
> 
> That's fine to me too, but currently setup_sorting() exits through
> usage_with_options() if sort_dimension__add() fails and I followed the
> convention here.  Making it to return will require changes to every
> callsites of the function.
> 
> If you think it's better to change, I can do it as well.

I think this is a good opportunity to do that :-)

I just grepped for 'setup_sorting' and we have some private ones in
builtin-kmem, for instance, that return a value and that value is
checked, etc. Good precendent :-)

- Arnaldo
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