linux-kernel - Re: [PATCH v2] perf parse-events: fix 3 use after frees

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Date:   Wed, 18 Mar 2020 10:47:15 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Ian Rogers <irogers@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Leo Yan <leo.yan@...aro.org>, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH v2] perf parse-events: fix 3 use after frees

Em Wed, Mar 18, 2020 at 11:28:27AM +0100, Jiri Olsa escreveu:
> On Sat, Mar 14, 2020 at 10:03:56AM -0700, Ian Rogers wrote:
> > Reproducible with a clang asan build and then running perf test in
> > particular 'Parse event definition strings'.
> > 
> > v2 frees the evsel->pmu_name avoiding a memory leak.
> > 
> > Signed-off-by: Ian Rogers <irogers@...gle.com>
> 
> Acked-by: Jiri Olsa <jolsa@...hat.com>

Thanks, applied.

- Arnaldo
 
> thanks,
> jirka
> 
> > ---
> >  tools/perf/util/evsel.c        | 1 +
> >  tools/perf/util/parse-events.c | 6 +++---
> >  2 files changed, 4 insertions(+), 3 deletions(-)
> > 
> > diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
> > index 816d930d774e..15ccd193483f 100644
> > --- a/tools/perf/util/evsel.c
> > +++ b/tools/perf/util/evsel.c
> > @@ -1287,6 +1287,7 @@ void perf_evsel__exit(struct evsel *evsel)
> >  	perf_thread_map__put(evsel->core.threads);
> >  	zfree(&evsel->group_name);
> >  	zfree(&evsel->name);
> > +	zfree(&evsel->pmu_name);
> >  	perf_evsel__object.fini(evsel);
> >  }
> >  
> > diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
> > index a14995835d85..593b6b03785d 100644
> > --- a/tools/perf/util/parse-events.c
> > +++ b/tools/perf/util/parse-events.c
> > @@ -1449,7 +1449,7 @@ int parse_events_add_pmu(struct parse_events_state *parse_state,
> >  		evsel = __add_event(list, &parse_state->idx, &attr, NULL, pmu, NULL,
> >  				    auto_merge_stats, NULL);
> >  		if (evsel) {
> > -			evsel->pmu_name = name;
> > +			evsel->pmu_name = name ? strdup(name) : NULL;
> >  			evsel->use_uncore_alias = use_uncore_alias;
> >  			return 0;
> >  		} else {
> > @@ -1497,7 +1497,7 @@ int parse_events_add_pmu(struct parse_events_state *parse_state,
> >  		evsel->snapshot = info.snapshot;
> >  		evsel->metric_expr = info.metric_expr;
> >  		evsel->metric_name = info.metric_name;
> > -		evsel->pmu_name = name;
> > +		evsel->pmu_name = name ? strdup(name) : NULL;
> >  		evsel->use_uncore_alias = use_uncore_alias;
> >  		evsel->percore = config_term_percore(&evsel->config_terms);
> >  	}
> > @@ -1547,7 +1547,7 @@ int parse_events_multi_pmu_add(struct parse_events_state *parse_state,
> >  				if (!parse_events_add_pmu(parse_state, list,
> >  							  pmu->name, head,
> >  							  true, true)) {
> > -					pr_debug("%s -> %s/%s/\n", config,
> > +					pr_debug("%s -> %s/%s/\n", str,
> >  						 pmu->name, alias->str);
> >  					ok++;
> >  				}
> > -- 
> > 2.25.1.481.gfbce0eb801-goog
> > 
> 

-- 

- Arnaldo