linux-kernel - Re: [RFC PATCH v2 01/13] perf parse-events: Fix comparison of evsel and leader pmu name

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Date:   Mon, 27 Apr 2020 10:03:53 +0100
From:   John Garry <john.garry@...wei.com>
To:     Jiri Olsa <jolsa@...hat.com>
CC:     <peterz@...radead.org>, <mingo@...hat.com>, <acme@...nel.org>,
        <mark.rutland@....com>, <alexander.shishkin@...ux.intel.com>,
        <namhyung@...nel.org>, <will@...nel.org>, <ak@...ux.intel.com>,
        <linuxarm@...wei.com>, <linux-kernel@...r.kernel.org>,
        <qiangqing.zhang@....com>, <irogers@...gle.com>,
        <robin.murphy@....com>, <zhangshaokun@...ilicon.com>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RFC PATCH v2 01/13] perf parse-events: Fix comparison of evsel
 and leader pmu name

On 27/04/2020 09:16, Jiri Olsa wrote:
> On Fri, Apr 17, 2020 at 06:41:12PM +0800, John Garry wrote:
>> Since we now strdup() the pmu name for the event selector, use strcmp()
>> instead of pointer equality for comparison.
>>
>> Fixes: d4953f7ef1a2 ("perf parse-events: Fix 3 use after frees found with clang ASANutil/parse-events.c")
>> Signed-off-by: John Garry <john.garry@...wei.com>
> 
> I don't ee this change in your branch:
>    private-topic-perf-5.6-sys-pmu-events-v2-upstream
> 
> do you have some updated tree?

I have started rebase work here:

https://github.com/hisilicon/kernel-dev/commits/private-topic-perf-5.7-sys-pmu-events-v2

Without this patch, I get this spewed for metric events:

	assertion failed at util/parse-events.c:1637

However, if there was a problem on mainline, I would expect some other 
reports now.

Thanks,
John



> 
>> ---
>>
>> I am not 100% sure that this is the right fix....
>>
>>   tools/perf/util/parse-events.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
>> index 10107747b361..90ddade1ba23 100644
>> --- a/tools/perf/util/parse-events.c
>> +++ b/tools/perf/util/parse-events.c
>> @@ -1629,7 +1629,7 @@ parse_events__set_leader_for_uncore_aliase(char *name, struct list_head *list,
>>   		 * event. That can be used to distinguish the leader from
>>   		 * other members, even they have the same event name.
>>   		 */
>> -		if ((leader != evsel) && (leader->pmu_name == evsel->pmu_name)) {
>> +		if ((leader != evsel) && !strcmp(leader->pmu_name, evsel->pmu_name)) {
>>   			is_leader = false;
>>   			continue;
>>   		}
>> -- 
>> 2.16.4
>>
> 
> .
>