linux-kernel - Re: [PATCH v2] perf session: add missing evlist_

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <YN4Dy9qLrop4pM+9@kernel.org>
Date:   Thu, 1 Jul 2021 15:04:59 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Ian Rogers <irogers@...gle.com>,
        Riccardo Mancini <rickyman7@...il.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Leo Yan <leo.yan@...aro.org>, linux-perf-users@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] perf session: add missing evlist__delete when
 deleting a session

Em Fri, Jun 25, 2021 at 01:54:03PM +0200, Jiri Olsa escreveu:
> On Thu, Jun 24, 2021 at 10:39:34PM -0700, Ian Rogers wrote:
> > On Thu, Jun 24, 2021 at 4:20 PM Riccardo Mancini <rickyman7@...il.com> wrote:
> > >
> > > ASan reports a memory leak caused by evlist not being deleted on exit in
> > > perf-report, perf-script and perf-data.
> > > The problem is caused by evlist->session not being deleted, which is
> > > allocated in perf_session__read_header, called in perf_session__new if
> > > perf_data is in read mode.
> > > In case of write mode, the session->evlist is filled by the caller.
> > > This patch solves the problem by calling evlist__delete in
> > > perf_session__delete if perf_data is in read mode.
> 
> ugh, I'm surprised we did not free that.. and can't find
> in git log we ever did ;-) I briefly check commands using
> sessions and looks like it's correct
> 
> Acked-by: Jiri Olsa <jolsa@...hat.com>
> 
> > 
> > Acked-by: Ian Rogers <irogers@...gle.com>
> > 
> > It is messy that in read mode the session owns the evlist, but
> > otherwise not. Imo, it'd be nice to make the ownership unconditional.
> 
> yep, would be nice

Thanks, applied.

Riccardo, next time please consider adding a Fixes: tag so that the
stable@...nel.org guys can pick this for stable releases.

- Arnaldo