linux-kernel - Re: [PATCH] perf util: Fix use after free in metric_

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Date:   Fri, 14 Jan 2022 11:47:42 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Ian Rogers <irogers@...gle.com>
Cc:     José Expósito <jose.exposito89@...il.com>,
        peterz@...radead.org, mingo@...hat.com, mark.rutland@....com,
        alexander.shishkin@...ux.intel.com, jolsa@...hat.com,
        namhyung@...nel.org, ak@...ux.intel.com, john.garry@...wei.com,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf util: Fix use after free in metric__new

Em Wed, Dec 08, 2021 at 09:33:14AM -0800, Ian Rogers escreveu:
> On Wed, Dec 8, 2021 at 9:11 AM José Expósito <jose.exposito89@...il.com> wrote:
> >
> > Addresses-Coverity-ID: 1494000
> > Signed-off-by: José Expósito <jose.exposito89@...il.com>
> 
> Acked-by: Ian Rogers <irogers@...gle,com>
> 
> This can only happen in the ENOMEM case, but it is a good fix.
> 
> Fixes: b85a4d61d302 (perf metric: Allow modifiers on metrics)

Sorry, I missed this one _as well_, sigh...

- Arnaldo
 
> Thanks,
> Ian
> 
> > ---
> >  tools/perf/util/metricgroup.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c
> > index fffe02aae3ed..4d2fed3aefd1 100644
> > --- a/tools/perf/util/metricgroup.c
> > +++ b/tools/perf/util/metricgroup.c
> > @@ -209,8 +209,8 @@ static struct metric *metric__new(const struct pmu_event *pe,
> >         m->metric_name = pe->metric_name;
> >         m->modifier = modifier ? strdup(modifier) : NULL;
> >         if (modifier && !m->modifier) {
> > -               free(m);
> >                 expr__ctx_free(m->pctx);
> > +               free(m);
> >                 return NULL;
> >         }
> >         m->metric_expr = pe->metric_expr;
> > --
> > 2.25.1
> >

-- 

- Arnaldo