linux-kernel - Re: [PATCH 01/13] perf script: Fix possible memory leaks

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Date:	Wed, 13 Aug 2014 09:21:31 +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>,
	Minchan Kim <minchan@...nel.org>
Subject: Re: [PATCH 01/13] perf script: Fix possible memory leaks

On 08/12/2014 09:40 AM, Namhyung Kim wrote:
> Some paths in perf script don't call perf_session__delete() after
> creating a new session.
> 
> Cc: Adrian Hunter <adrian.hunter@...el.com>
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> ---
>  tools/perf/builtin-script.c | 35 ++++++++++++++++++++++-------------
>  1 file changed, 22 insertions(+), 13 deletions(-)
> 
> diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
> index 868c17d09762..534172b889c3 100644
> --- a/tools/perf/builtin-script.c
> +++ b/tools/perf/builtin-script.c
> @@ -1471,12 +1471,13 @@ int cmd_script(int argc, const char **argv, const char *prefix __maybe_unused)
>  	bool show_full_info = false;
>  	bool header = false;
>  	bool header_only = false;
> +	bool script_started = false;
>  	char *rec_script_path = NULL;
>  	char *rep_script_path = NULL;
>  	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 +1731,15 @@ 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 +1754,60 @@ 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;

Need to get errno before calling perror().

> +			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);
> +		script_started = true;
>  	}
>  
>  
>  	err = perf_session__check_output_opt(session);
>  	if (err < 0)
> -		goto out;
> +		goto out_delete;
>  
>  	err = __cmd_script(&script);
>  
> +out_delete:

I added a flush method in a patch which acme has stashed in his
tmp.perf/core branch.  It would go here:

	if (script_started)
		flush_scripting();

>  	perf_session__delete(session);
> -	cleanup_scripting();
> +
> +	if (script_started)
> +		cleanup_scripting();
>  out:
>  	return err;
>  }
> 

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