linux-kernel - Re: [PATCH] perf script: Fix possible memory leaks

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Message-ID: <53DB7AC3.3030207@intel.com>
Date:	Fri, 01 Aug 2014 14:32:19 +0300
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Namhyung Kim <namhyung@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...nel.org>
CC:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Jiri Olsa <jolsa@...hat.com>, David Ahern <dsahern@...il.com>
Subject: Re: [PATCH] perf script: Fix possible memory leaks

On 1/08/2014 11:24 a.m., Namhyung Kim wrote:
> Some paths in perf script don't call perf_session__delete() after
> creating a new session.
>
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> ---
>   tools/perf/builtin-script.c | 31 ++++++++++++++++++-------------
>   1 file changed, 18 insertions(+), 13 deletions(-)
>
> diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
> index f57035b89c15..df0f84d7e825 100644
> --- a/tools/perf/builtin-script.c
> +++ b/tools/perf/builtin-script.c
> @@ -1476,7 +1476,7 @@ int cmd_script(int argc, const char **argv, const char *prefix __maybe_unused)
>   	struct perf_session *session;
>   	char *script_path = NULL;
>   	const char **__argv;
> -	int i, j, err;
> +	int i, j, err = 0;
>   	struct perf_script script = {
>   		.tool = {
>   			.sample		 = process_sample_event,
> @@ -1730,14 +1730,15 @@ int cmd_script(int argc, const char **argv, const char *prefix __maybe_unused)
>   	if (header || header_only) {
>   		perf_session__fprintf_info(session, stdout, show_full_info);
>   		if (header_only)
> -			return 0;
> +			goto out_delete;
>   	}
>
>   	script.session = session;
>
>   	if (cpu_list) {
> -		if (perf_session__cpu_bitmap(session, cpu_list, cpu_bitmap))
> -			return -1;
> +		err = perf_session__cpu_bitmap(session, cpu_list, cpu_bitmap);
> +		if (err < 0)
> +			goto out_delete;
>   	}
>
>   	if (!no_callchain)
> @@ -1752,53 +1753,57 @@ int cmd_script(int argc, const char **argv, const char *prefix __maybe_unused)
>   		if (output_set_by_user()) {
>   			fprintf(stderr,
>   				"custom fields not supported for generated scripts");
> -			return -1;
> +			err = -EINVAL;
> +			goto out_delete;
>   		}
>
>   		input = open(file.path, O_RDONLY);	/* input_name */
>   		if (input < 0) {
>   			perror("failed to open file");
> -			return -1;
> +			err = -errno;
> +			goto out_delete;
>   		}
>
>   		err = fstat(input, &perf_stat);
>   		if (err < 0) {
>   			perror("failed to stat file");
> -			return -1;
> +			goto out_delete;
>   		}
>
>   		if (!perf_stat.st_size) {
>   			fprintf(stderr, "zero-sized file, nothing to do!\n");
> -			return 0;
> +			goto out_delete;
>   		}
>
>   		scripting_ops = script_spec__lookup(generate_script_lang);
>   		if (!scripting_ops) {
>   			fprintf(stderr, "invalid language specifier");
> -			return -1;
> +			err = -ENOENT;
> +			goto out_delete;
>   		}
>
>   		err = scripting_ops->generate_script(session->tevent.pevent,
>   						     "perf-script");
> -		goto out;
> +		goto out_delete;
>   	}
>
>   	if (script_name) {
>   		err = scripting_ops->start_script(script_name, argc, argv);
>   		if (err)
> -			goto out;
> +			goto out_delete;
>   		pr_debug("perf script started with script %s\n\n", script_name);
>   	}
>
>
>   	err = perf_session__check_output_opt(session);
>   	if (err < 0)
> -		goto out;
> +		goto out_delete;
>
>   	err = __cmd_script(&script);
>
> -	perf_session__delete(session);
>   	cleanup_scripting();
> +out_delete:
> +	perf_session__delete(session);

Some of the db-export scripting I do relies on the session
being deleted before the script is stopped.  I would prefer
the original order i.e. perf_session__delete() then
cleanup_scripting()
--
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