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

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Date:   Wed, 23 Oct 2019 16:22:25 +0800
From:   Yunfeng Ye <yeyunfeng@...wei.com>
To:     Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
CC:     <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()



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.

> - 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
>