linux-kernel - Re: [PATCH v2] perf jevents: Fix resource leak in process

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Message-ID: <20191024134858.GB1666@kernel.org>
Date:   Thu, 24 Oct 2019 10:48:58 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Yunfeng Ye <yeyunfeng@...wei.com>
Cc:     Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>,
        peterz@...radead.org, mingo@...hat.com, mark.rutland@....com,
        alexander.shishkin@...ux.intel.com, jolsa@...hat.com,
        namhyung@...nel.org, john.garry@...wei.com, ak@...ux.intel.com,
        lukemujica@...gle.com, kan.liang@...ux.intel.com,
        yuzenghui@...wei.com,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        hushiyuan@...wei.com, linfeilong@...wei.com
Subject: Re: [PATCH v2] perf jevents: Fix resource leak in process_mapfile()
 and main()

Em Wed, Oct 23, 2019 at 04:22:25PM +0800, Yunfeng Ye escreveu:
> 
> 
> On 2019/10/16 22:25, Arnaldo Carvalho de Melo wrote:
> > Em Wed, Oct 16, 2019 at 09:50:17PM +0800, Yunfeng Ye escreveu:
> >> There are memory leaks and file descriptor resource leaks in
> >> process_mapfile() and main().
> >>
> >> Fix this by adding free(), fclose() and free_arch_std_events()
> >> on the error paths.
> >>
> >> Fixes: 80eeb67fe577 ("perf jevents: Program to convert JSON file")
> >> Fixes: 3f056b66647b ("perf jevents: Make build fail on JSON parse error")
> >> Fixes: e9d32c1bf0cd ("perf vendor events: Add support for arch standard events")
> > 
> > Nice, thanks for adding the fixes line, I looked at those three patches
> > and indeed they were leaky, thanks for the fixes, we shouldn't have
> > those leaks even if that, for now, makes the tool to end anyway.
> > 
> The other 3 patchs have been applied, is this patch applied ? thanks.

Applied now, thanks for the reminder,

- Arnaldo
 
> > - Arnaldo
> > 
> >> Signed-off-by: Yunfeng Ye <yeyunfeng@...wei.com>
> >> ---
> >> v1 -> v2:
> >>  - add free(eventsfp) to fix eventsfp resource leaks
> >>  - add free_arch_std_events() on the error path
> >>
> >>  tools/perf/pmu-events/jevents.c | 13 +++++++++++--
> >>  1 file changed, 11 insertions(+), 2 deletions(-)
> >>
> >> diff --git a/tools/perf/pmu-events/jevents.c b/tools/perf/pmu-events/jevents.c
> >> index e2837260ca4d..99e3fd04a5cb 100644
> >> --- a/tools/perf/pmu-events/jevents.c
> >> +++ b/tools/perf/pmu-events/jevents.c
> >> @@ -758,6 +758,7 @@ static int process_mapfile(FILE *outfp, char *fpath)
> >>  	char *line, *p;
> >>  	int line_num;
> >>  	char *tblname;
> >> +	int ret = 0;
> >>
> >>  	pr_info("%s: Processing mapfile %s\n", prog, fpath);
> >>
> >> @@ -769,6 +770,7 @@ static int process_mapfile(FILE *outfp, char *fpath)
> >>  	if (!mapfp) {
> >>  		pr_info("%s: Error %s opening %s\n", prog, strerror(errno),
> >>  				fpath);
> >> +		free(line);
> >>  		return -1;
> >>  	}
> >>
> >> @@ -795,7 +797,8 @@ static int process_mapfile(FILE *outfp, char *fpath)
> >>  			/* TODO Deal with lines longer than 16K */
> >>  			pr_info("%s: Mapfile %s: line %d too long, aborting\n",
> >>  					prog, fpath, line_num);
> >> -			return -1;
> >> +			ret = -1;
> >> +			goto out;
> >>  		}
> >>  		line[strlen(line)-1] = '\0';
> >>
> >> @@ -825,7 +828,9 @@ static int process_mapfile(FILE *outfp, char *fpath)
> >>
> >>  out:
> >>  	print_mapping_table_suffix(outfp);
> >> -	return 0;
> >> +	fclose(mapfp);
> >> +	free(line);
> >> +	return ret;
> >>  }
> >>
> >>  /*
> >> @@ -1122,6 +1127,7 @@ int main(int argc, char *argv[])
> >>  		goto empty_map;
> >>  	} else if (rc < 0) {
> >>  		/* Make build fail */
> >> +		fclose(eventsfp);
> >>  		free_arch_std_events();
> >>  		return 1;
> >>  	} else if (rc) {
> >> @@ -1134,6 +1140,7 @@ int main(int argc, char *argv[])
> >>  		goto empty_map;
> >>  	} else if (rc < 0) {
> >>  		/* Make build fail */
> >> +		fclose(eventsfp);
> >>  		free_arch_std_events();
> >>  		return 1;
> >>  	} else if (rc) {
> >> @@ -1151,6 +1158,8 @@ int main(int argc, char *argv[])
> >>  	if (process_mapfile(eventsfp, mapfile)) {
> >>  		pr_info("%s: Error processing mapfile %s\n", prog, mapfile);
> >>  		/* Make build fail */
> >> +		fclose(eventsfp);
> >> +		free_arch_std_events();
> >>  		return 1;
> >>  	}
> >>
> >> -- 
> >> 2.7.4.3
> > 

-- 

- Arnaldo