linux-kernel - Re: [PATCH v2 3/4] perf tools: Check NULL after zalloc() and Use zfree() instead of free() in parse-events.c

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Date:   Wed, 1 Feb 2017 17:04:08 +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>,
        Wang Nan <wangnan0@...wei.com>, Jiri Olsa <jolsa@...hat.com>
Subject: Re: [PATCH v2 3/4] perf tools: Check NULL after zalloc() and Use
 zfree() instead of free() in parse-events.c

Sorry I'm late..
I got it!
I'll send v3 with changed patches !!

Thanks,
Taeung

On 01/31/2017 10:23 PM, Arnaldo Carvalho de Melo wrote:
> Em Tue, Jan 31, 2017 at 08:38:30PM +0900, Taeung Song escreveu:
>> Currently there are several parts not checking NULL
>> after allocating with zalloc() or asigning NULL value
>> to a pointer variable after doing free().
>>
>> So I fill in code checking NULL and
>> use zfree() instead of free().
>
> You are doing more than one thing on this patch, don't do that.
>
> Please split it for the "no functional changes" parts, i.e. things like
>
> -		free(path);
> -		path = NULL;
> +		zfree(&path);
>
> From the ones that _change_ logic, like the first hunk:
>
>  				path = zalloc(sizeof(*path));
> +				if (!path)
> +					return NULL;
>  				path->system = malloc(MAX_EVENT_LENGTH);
>  				if (!path->system) {
>  					free(path);
>
> This one as well changes logic:
>
> @@ -1563,7 +1563,7 @@ perf_pmu__parse_check(const char *name)
>  	r = bsearch(&p, perf_pmu_events_list,
>  			(size_t) perf_pmu_events_list_num,
>  			sizeof(struct perf_pmu_event_symbol), comp_pmu);
> -	free(p.symbol);
> +	zfree(&p.symbol);
>  	return r ? r->type : PMU_EVENT_SYMBOL_ERR;
>
>
>> Cc: Namhyung Kim <namhyung@...nel.org>
>> Cc: Jiri Olsa <jolsa@...hat.com>
>> Signed-off-by: Taeung Song <treeze.taeung@...il.com>
>> ---
>>  tools/perf/util/parse-events.c | 20 ++++++++++----------
>>  1 file changed, 10 insertions(+), 10 deletions(-)
>>
>> diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
>> index 3c876b8..87a3e5a 100644
>> --- a/tools/perf/util/parse-events.c
>> +++ b/tools/perf/util/parse-events.c
>> @@ -211,6 +211,8 @@ struct tracepoint_path *tracepoint_id_to_path(u64 config)
>>  				closedir(evt_dir);
>>  				closedir(sys_dir);
>>  				path = zalloc(sizeof(*path));
>> +				if (!path)
>> +					return NULL;
>>  				path->system = malloc(MAX_EVENT_LENGTH);
>>  				if (!path->system) {
>>  					free(path);
>> @@ -252,8 +254,7 @@ struct tracepoint_path *tracepoint_name_to_path(const char *name)
>>  	if (path->system == NULL || path->name == NULL) {
>>  		zfree(&path->system);
>>  		zfree(&path->name);
>> -		free(path);
>> -		path = NULL;
>> +		zfree(&path);
>>  	}
>>
>>  	return path;
>> @@ -1477,10 +1478,9 @@ static void perf_pmu__parse_cleanup(void)
>>
>>  		for (i = 0; i < perf_pmu_events_list_num; i++) {
>>  			p = perf_pmu_events_list + i;
>> -			free(p->symbol);
>> +			zfree(&p->symbol);
>>  		}
>> -		free(perf_pmu_events_list);
>> -		perf_pmu_events_list = NULL;
>> +		zfree(&perf_pmu_events_list);
>>  		perf_pmu_events_list_num = 0;
>>  	}
>>  }
>> @@ -1563,7 +1563,7 @@ perf_pmu__parse_check(const char *name)
>>  	r = bsearch(&p, perf_pmu_events_list,
>>  			(size_t) perf_pmu_events_list_num,
>>  			sizeof(struct perf_pmu_event_symbol), comp_pmu);
>> -	free(p.symbol);
>> +	zfree(&p.symbol);
>>  	return r ? r->type : PMU_EVENT_SYMBOL_ERR;
>>  }
>>
>> @@ -1710,8 +1710,8 @@ static void parse_events_print_error(struct parse_events_error *err,
>>  		fprintf(stderr, "%*s\\___ %s\n", idx + 1, "", err->str);
>>  		if (err->help)
>>  			fprintf(stderr, "\n%s\n", err->help);
>> -		free(err->str);
>> -		free(err->help);
>> +		zfree(&err->str);
>> +		zfree(&err->help);
>>  	}
>>
>>  	fprintf(stderr, "Run 'perf list' for a list of valid events\n");
>> @@ -2406,7 +2406,7 @@ void parse_events_terms__purge(struct list_head *terms)
>>
>>  	list_for_each_entry_safe(term, h, terms, list) {
>>  		if (term->array.nr_ranges)
>> -			free(term->array.ranges);
>> +			zfree(&term->array.ranges);
>>  		list_del_init(&term->list);
>>  		free(term);
>>  	}
>> @@ -2422,7 +2422,7 @@ void parse_events_terms__delete(struct list_head *terms)
>>
>>  void parse_events__clear_array(struct parse_events_array *a)
>>  {
>> -	free(a->ranges);
>> +	zfree(&a->ranges);
>>  }
>>
>>  void parse_events_evlist_error(struct parse_events_evlist *data,
>> --
>> 2.7.4