linux-kernel - Re: [BUGFIX][PATCH v6 2/9] perf config: If collect_config() is failed, finally free a config set after it is done

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Date:	Tue, 7 Jun 2016 06:37:36 +0900
From:	Taeung Song <treeze.taeung@...il.com>
To:	Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
Cc:	linux-kernel@...r.kernel.org, Jiri Olsa <jolsa@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Jiri Olsa <jolsa@...hat.com>
Subject: Re: [BUGFIX][PATCH v6 2/9] perf config: If collect_config() is
 failed, finally free a config set after it is done



On 06/07/2016 05:23 AM, Arnaldo Carvalho de Melo wrote:
> Em Mon, Jun 06, 2016 at 07:52:53PM +0900, Taeung Song escreveu:
>> Because of die() at perf_parse_file() a config set was freed
>> in collect_config(), if failed.
>> But it is natural to free a config set after collect_config() is done
>> when some problems happened.
>>
>> So, in case of failure, lastly free a config set at perf_config_set__new()
>> instead of freeing the config set in collect_config().
>>
>> Cc: Namhyung Kim <namhyung@...nel.org>
>> Cc: Jiri Olsa <jolsa@...hat.com>
>> Cc: Masami Hiramatsu <mhiramat@...nel.org>
>> Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
>> Signed-off-by: Taeung Song <treeze.taeung@...il.com>
>> ---
>>   tools/perf/util/config.c | 4 ++--
>>   1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/tools/perf/util/config.c b/tools/perf/util/config.c
>> index b500737..d013f90 100644
>> --- a/tools/perf/util/config.c
>> +++ b/tools/perf/util/config.c
>> @@ -639,7 +639,6 @@ static int collect_config(const char *var, const char *value,
>>
>>   out_free:
>>   	free(key);
>> -	perf_config_set__delete(set);
>>   	return -1;
>>   }
>>
>> @@ -649,7 +648,8 @@ struct perf_config_set *perf_config_set__new(void)
>>
>>   	if (set) {
>>   		INIT_LIST_HEAD(&set->sections);
>> -		perf_config(collect_config, set);
>> +		if (perf_config(collect_config, set) < 0)
>> +			perf_config_set__delete(set);
>>   	}
>>
>>   	return set;
>
> You can't do that, there is something missing, without looking at the
> code I think you need:
>
>   	if (set) {
>   		INIT_LIST_HEAD(&set->sections);
> -		perf_config(collect_config, set);
> +		if (perf_config(collect_config, set) < 0) {
> +			perf_config_set__delete(set);
> +			set = NULL;
> +		}
>   	}
>
>   	return set;
>
> No?
>

Granted
Sorry for missing above..

I modified using 'return NULL;' instead of 'set = NULL;' as below

diff --git a/tools/perf/util/config.c b/tools/perf/util/config.c
index c73f1c4..cb749d3 100644
--- a/tools/perf/util/config.c
+++ b/tools/perf/util/config.c
@@ -643,7 +643,6 @@ static int collect_config(const char *var, const 
char *value,

  out_free:
          free(key);
-        perf_config_set__delete(set);
          return -1;
  }

@@ -653,7 +652,10 @@ struct perf_config_set *perf_config_set__new(void)

          if (set) {
                  INIT_LIST_HEAD(&set->sections);
-                perf_config(collect_config, set);
+                if (perf_config(collect_config, set) < 0) {
+                        perf_config_set__delete(set);
+                        return NULL;
+                }
          }

          return set;

Because in near future, perf_config_set__delete() will use zfree().

will send changed this patch soon !
Thank you for your review :)

Taeung