linux-kernel - Re: [PATCH 2/2] perf evsel: Check for NULL before perf_evsel__is_bpf

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Date:   Mon, 30 Jan 2017 19:26:30 +0900
From:   Taeung Song <treeze.taeung@...il.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        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>
Subject: Re: [PATCH 2/2] perf evsel: Check for NULL before
 perf_evsel__is_bpf_output()

Hi, jirka :)

Thank you!
Taeung

On 01/30/2017 05:55 PM, Jiri Olsa wrote:
> On Mon, Jan 30, 2017 at 02:23:39PM +0900, Taeung Song wrote:
>> If 'evsel' is NULL, in perf_evsel__is_bpf_output()
>> NULL pointer error can happen so check it.
>>
>> Cc: Jiri Olsa <jolsa@...hat.com>
>> Cc: Namhyung Kim <namhyung@...nel.org>
>> Signed-off-by: Taeung Song <treeze.taeung@...il.com>
>> ---
>>  tools/perf/util/evsel.c | 6 ++++--
>>  1 file changed, 4 insertions(+), 2 deletions(-)
>>
>> diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
>> index 04e536a..b77da72 100644
>> --- a/tools/perf/util/evsel.c
>> +++ b/tools/perf/util/evsel.c
>> @@ -242,8 +242,10 @@ struct perf_evsel *perf_evsel__new_idx(struct perf_event_attr *attr, int idx)
>>  {
>>  	struct perf_evsel *evsel = zalloc(perf_evsel__object.size);
>>
>> -	if (evsel != NULL)
>> -		perf_evsel__init(evsel, attr, idx);
>> +	if (!evsel)
>> +		return NULL;
>> +
>> +	perf_evsel__init(evsel, attr, idx);
>
> Acked-by: Jiri Olsa <jolsa@...nel.org>
>
> thanks,
> jirka
>