linux-kernel - Re: [PATCH v1 1/2] perf metrics: Avoid segv if default metricgroup isn't set

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Date:   Tue, 5 Dec 2023 12:51:12 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Ilkka Koskinen <ilkka@...amperecomputing.com>,
        Ian Rogers <irogers@...gle.com>,
        John Garry <john.g.garry@...cle.com>,
        Will Deacon <will@...nel.org>,
        James Clark <james.clark@....com>,
        Mike Leach <mike.leach@...aro.org>,
        Leo Yan <leo.yan@...aro.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/2] perf metrics: Avoid segv if default metricgroup
 isn't set

Em Mon, Dec 04, 2023 at 07:33:18PM -0800, Namhyung Kim escreveu:
> On Mon, Dec 4, 2023 at 2:45 PM Ilkka Koskinen <ilkka@...amperecomputing.com> wrote:
> > On Mon, 4 Dec 2023, Ian Rogers wrote:
> > > A metric is default by having "Default" within its groups. The default
> > > metricgroup name needn't be set and this can result in segv in
> > > default_metricgroup_cmp and perf_stat__print_shadow_stats_metricgroup
> > > that assume it has a value when there is a Default metric group. To
> > > avoid the segv initialize the value to "".

> > > Fixes: 1c0e47956a8e ("perf metrics: Sort the Default metricgroup")
> > > Signed-off-by: Ian Rogers <irogers@...gle.com>

> > Thanks! I was going to look for the bug but got pulled to other
> > tasks. The patch looks good to me and I tested it successfully on
> > AmpereOne.

> >    Reviewed-and-tested-by: Ilkka Koskinen <ilkka@...amperecomputing.com>
 
> Looks like it needs to go through perf-tools for v6.7.
> Ian, do you think this one is enough?

So I had this on my local perf-tools-next, removed now, I also have some
other fixes by Ian on the tmp.perf-tools-next, please let me know what
you guys decide to have in perf-tools for v6.7 so that I can remove it
from there.

- Arnaldo