linux-kernel - Re: [PATCH v2] perf: fix double free at function perf_hpp__reset_output

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Date:   Mon, 10 Apr 2017 10:13:19 +0800
From:   "Du, Changbin" <changbin.du@...el.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     "Du, Changbin" <changbin.du@...el.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] perf: fix double free at function
 perf_hpp__reset_output_field

On Sun, Apr 09, 2017 at 07:05:52PM +0200, Jiri Olsa wrote:
> On Wed, Apr 05, 2017 at 10:44:22AM +0800, Du, Changbin wrote:
> > On Tue, Apr 04, 2017 at 12:51:03PM -0300, Arnaldo Carvalho de Melo wrote:
> > > Em Wed, Apr 05, 2017 at 12:34:59AM +0900, Namhyung Kim escreveu:
> > > > Hi Arnaldo,
> > > > 
> > > > On Wed, Apr 5, 2017 at 12:19 AM, Arnaldo Carvalho de Melo
> > > > <acme@...nel.org> wrote:
> > > > > Em Mon, Mar 27, 2017 at 02:22:55PM +0800, changbin.du@...el.com escreveu:
> > > > >> From: Changbin Du <changbin.du@...el.com>
> > > > >>
> > > > >> Some perf_hpp_fmt both registered at field and sort list. For such
> > > > >> instance, we only can free it when removed from the both lists. This
> > > > >> function currently only used by self-test code, but still should fix
> > > > >> it.
> > > > >
> > > > > Looks sane, applying,
> > > > >
> > > > > Jiri, Namhyung, please holler (or ack) if needed,
> > > > 
> > > > Did you actually see the double free problem?  AFAICS the old code
> > > 
> > > I assumed that he had seen it, in some self-test code, Changbin, can you
> > > please show command output or further describe when this patch would be
> > > necessary?
> > > 
> > Arnaldo, I did observe this issue but not in self-test code. The self-test code
> > uses that function but does not have a case that a fmt linked to two both list. 
> > I found this issue when I try to add 'dynamic sort' feature to perf, which
> > I use this function to reset out fields.
> 
> could you post it with the rest of your patches? might be easier to review
>
jirka, I am sorry that the 'dynamic sort' is only half done. Now I am
very busy with work at hand. I will send the rest of patches when I
finish them. Could we check out this fix first?

> thanks,
> jirka

-- 
Thanks,
Changbin Du

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