linux-kernel - Re: [PATCH] perf parse-events: fix memory leaks found on parse

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Date:   Wed, 18 Mar 2020 11:40:11 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        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] perf parse-events: fix memory leaks found on parse_events

On Sun, Mar 15, 2020 at 09:14:31PM -0700, Ian Rogers wrote:
> Memory leaks found by applying LLVM's libfuzzer on the parse_events
> function.
> 
> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---
>  tools/lib/perf/evlist.c        | 2 ++
>  tools/perf/util/parse-events.c | 2 ++
>  tools/perf/util/parse-events.y | 3 ++-
>  3 files changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/lib/perf/evlist.c b/tools/lib/perf/evlist.c
> index 5b9f2ca50591..6485d1438f75 100644
> --- a/tools/lib/perf/evlist.c
> +++ b/tools/lib/perf/evlist.c
> @@ -125,8 +125,10 @@ static void perf_evlist__purge(struct perf_evlist *evlist)
>  void perf_evlist__exit(struct perf_evlist *evlist)
>  {
>  	perf_cpu_map__put(evlist->cpus);
> +	perf_cpu_map__put(evlist->all_cpus);

ugh, yes, could you please put it to separate libperf patch?

>  	perf_thread_map__put(evlist->threads);
>  	evlist->cpus = NULL;
> +	evlist->all_cpus = NULL;

there's already change adding this waiting on the list:
  https://lore.kernel.org/lkml/1583665157-349023-1-git-send-email-zhe.he@windriver.com/

>  	evlist->threads = NULL;
>  	fdarray__exit(&evlist->pollfd);
>  }
> diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
> index a14995835d85..997862224292 100644
> --- a/tools/perf/util/parse-events.c
> +++ b/tools/perf/util/parse-events.c
> @@ -1482,6 +1482,8 @@ int parse_events_add_pmu(struct parse_events_state *parse_state,
>  
>  		list_for_each_entry_safe(pos, tmp, &config_terms, list) {
>  			list_del_init(&pos->list);
> +			if (pos->free_str)
> +				free(pos->val.str);

ack, would be nice to have  perf_evsel__free_config_terms generalized
to work directly over config terms list, so we'd have only single
cleanup function

>  			free(pos);
>  		}
>  		return -EINVAL;
> diff --git a/tools/perf/util/parse-events.y b/tools/perf/util/parse-events.y
> index 94f8bcd83582..8212cc771667 100644
> --- a/tools/perf/util/parse-events.y
> +++ b/tools/perf/util/parse-events.y
> @@ -44,7 +44,7 @@ static void free_list_evsel(struct list_head* list_evsel)
>  
>  	list_for_each_entry_safe(evsel, tmp, list_evsel, core.node) {
>  		list_del_init(&evsel->core.node);
> -		perf_evsel__delete(evsel);
> +		evsel__delete(evsel);

ack

>  	}
>  	free(list_evsel);
>  }
> @@ -326,6 +326,7 @@ PE_NAME opt_pmu_config
>  	}
>  	parse_events_terms__delete($2);
>  	parse_events_terms__delete(orig_terms);
> +	free(pattern);

ack

could you please send the separate change for libperf?
and synchronize with that other patch mentioned above

thanks,
jirka