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From: Arnaldo Carvalho de Melo <acme@kernel.org>
To: Riccardo Mancini <rickyman7@gmail.com>
Cc: Ian Rogers <irogers@google.com>,
	Namhyung Kim <namhyung@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>,
	Mark Rutland <mark.rutland@arm.com>, Jiri Olsa <jolsa@redhat.com>,
	linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org
Subject: Re: [PATCH 15/20] perf trace: free malloc'd trace fields on exit
Date: Thu, 15 Jul 2021 17:32:23 -0300	[thread overview]
Message-ID: <YPCbV92iVme1WdFs@kernel.org> (raw)
In-Reply-To: <de5945ed5c0cb882cbfa3268567d0bff460ff016.1626343282.git.rickyman7@gmail.com>

Em Thu, Jul 15, 2021 at 06:07:20PM +0200, Riccardo Mancini escreveu:
> ASan reports several memory leaks running the perf test
> "88: Check open filename arg using perf trace + vfs_getname".
> The first of these leaks is related to struct trace fields never being
> deallocated.
> 
> This patch adds the function trace__exit, which is called at the end of
> cmd_trace, replacing the existing deallocation, which is now moved
> inside the new function.
> This function deallocates:
>  - ev_qualifier
>  - ev_qualifier_ids.entries
>  - syscalls.table
>  - sctbl
>  - perfconfig_events
> 
> In order to prevent errors in case any of this field is never
> initialized, this patch also adds initialization to NULL to these
> fields.
> 
> Signed-off-by: Riccardo Mancini <rickyman7@gmail.com>
> ---
>  tools/perf/builtin-trace.c | 17 ++++++++++++++++-
>  1 file changed, 16 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
> index 7ec18ff57fc4ae35..fe26d87ca8ccc14d 100644
> --- a/tools/perf/builtin-trace.c
> +++ b/tools/perf/builtin-trace.c
> @@ -4701,6 +4701,15 @@ static int trace__config(const char *var, const char *value, void *arg)
>  	return err;
>  }
>  
> +static void trace__exit(struct trace *trace)
> +{
> +	strlist__delete(trace->ev_qualifier);
> +	free(trace->ev_qualifier_ids.entries);
> +	free(trace->syscalls.table);
> +	syscalltbl__delete(trace->sctbl);
> +	zfree(&trace->perfconfig_events);
> +}
> +
>  int cmd_trace(int argc, const char **argv)
>  {
>  	const char *trace_usage[] = {
> @@ -4731,6 +4740,12 @@ int cmd_trace(int argc, const char **argv)
>  		.kernel_syscallchains = false,
>  		.max_stack = UINT_MAX,
>  		.max_events = ULONG_MAX,
> +		.ev_qualifier = NULL,
> +		.sctbl = NULL,
> +		.ev_qualifier_ids = {
> +			.entries = NULL,
> +			.nr = 0,
> +		},
>  	};
>  	const char *map_dump_str = NULL;
>  	const char *output_name = NULL;

The above hunk is not needed, as all non explicitely initialized members
will be zeroed, so to reduce patch size I'm dropping it.

Thanks, applied.

- Arnaldo


> @@ -5135,6 +5150,6 @@ int cmd_trace(int argc, const char **argv)
>  	if (output_name != NULL)
>  		fclose(trace.output);
>  out:
> -	zfree(&trace.perfconfig_events);
> +	trace__exit(&trace);
>  	return err;
>  }
> -- 
> 2.31.1
> 

-- 

- Arnaldo

  reply	other threads:[~2021-07-15 20:32 UTC|newest]

Thread overview: 47+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-15 16:07 [PATCH 00/20] perf: fix several memory leaks reported by ASan on perf-test Riccardo Mancini
2021-07-15 16:07 ` [PATCH 01/20] perf nsinfo: fix refcounting Riccardo Mancini
2021-07-15 19:02   ` Arnaldo Carvalho de Melo
2021-07-15 19:07     ` Arnaldo Carvalho de Melo
2021-07-15 19:20     ` Arnaldo Carvalho de Melo
2021-07-15 19:44     ` Arnaldo Carvalho de Melo
2021-07-15 16:07 ` [PATCH 02/20] perf env: fix sibling_dies memory leak Riccardo Mancini
2021-07-15 19:49   ` Arnaldo Carvalho de Melo
2021-07-16 13:13     ` Riccardo Mancini
2021-07-15 16:07 ` [PATCH 03/20] perf test: session_topology: delete session->evlist Riccardo Mancini
2021-07-15 19:51   ` Arnaldo Carvalho de Melo
2021-07-15 16:07 ` [PATCH 04/20] perf test: event_update: fix memory leak of evlist Riccardo Mancini
2021-07-15 19:54   ` Arnaldo Carvalho de Melo
2021-07-15 16:07 ` [PATCH 05/20] perf test: event_update: fix memory leak of unit Riccardo Mancini
2021-07-15 19:58   ` Arnaldo Carvalho de Melo
2021-07-15 16:07 ` [PATCH 06/20] perf dso: fix memory leak in dso__new_map Riccardo Mancini
2021-07-15 20:01   ` Arnaldo Carvalho de Melo
2021-07-15 20:07   ` Arnaldo Carvalho de Melo
2021-07-15 16:07 ` [PATCH 07/20] perf test: maps__merge_in: fix memory leak of maps Riccardo Mancini
2021-07-15 20:10   ` Arnaldo Carvalho de Melo
2021-07-15 16:07 ` [PATCH 08/20] perf env: fix memory leak of cpu_pmu_caps Riccardo Mancini
2021-07-15 20:12   ` Arnaldo Carvalho de Melo
2021-07-15 16:07 ` [PATCH 09/20] perf report: free generated help strings for sort option Riccardo Mancini
2021-07-15 20:15   ` Arnaldo Carvalho de Melo
2021-07-15 16:07 ` [PATCH 10/20] perf inject: close inject.output Riccardo Mancini
2021-07-15 20:17   ` Arnaldo Carvalho de Melo
2021-07-15 16:07 ` [PATCH 11/20] perf session: cleanup trace_event Riccardo Mancini
2021-07-15 20:21   ` Arnaldo Carvalho de Melo
2021-07-15 16:07 ` [PATCH 12/20] perf script: release zstd data Riccardo Mancini
2021-07-15 20:23   ` Arnaldo Carvalho de Melo
2021-07-15 16:07 ` [PATCH 13/20] perf script: fix memory leaks in perf_script Riccardo Mancini
2021-07-15 20:25   ` Arnaldo Carvalho de Melo
2021-07-15 16:07 ` [PATCH 14/20] perf util/lzma: close lzma stream Riccardo Mancini
2021-07-15 20:31   ` Arnaldo Carvalho de Melo
2021-07-15 16:07 ` [PATCH 15/20] perf trace: free malloc'd trace fields on exit Riccardo Mancini
2021-07-15 20:32   ` Arnaldo Carvalho de Melo [this message]
2021-07-15 16:07 ` [PATCH 16/20] perf trace: free syscall->arg_fmt Riccardo Mancini
2021-07-15 20:35   ` Arnaldo Carvalho de Melo
2021-07-15 16:07 ` [PATCH 17/20] perf trace: free syscall tp fields in evsel->priv Riccardo Mancini
2021-07-15 20:35   ` Arnaldo Carvalho de Melo
2021-07-15 16:07 ` [PATCH 18/20] perf trace: free strings in trace__parse_events_option Riccardo Mancini
2021-07-15 20:36   ` Arnaldo Carvalho de Melo
2021-07-15 16:07 ` [PATCH 19/20] perf test: bpf: free obj_buf Riccardo Mancini
2021-07-15 20:39   ` Arnaldo Carvalho de Melo
2021-07-16 16:50   ` Arnaldo Carvalho de Melo
2021-07-15 16:07 ` [PATCH 20/20] perf util/probe-file: delete namelist on error in del_events Riccardo Mancini
2021-07-15 20:41   ` Arnaldo Carvalho de Melo

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