linux-kernel - Re: [PATCH v2] perf parse: Copy string to perf_evsel_config

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Message-ID: <20200107100906.GA23348@leoy-ThinkPad-X240s>
Date:   Tue, 7 Jan 2020 18:09:06 +0800
From:   Leo Yan <leo.yan@...aro.org>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Arnaldo Carvalho de Melo <acme@...hat.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Andi Kleen <ak@...ux.intel.com>, linux-kernel@...r.kernel.org,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Mike Leach <mike.leach@...aro.org>,
        Suzuki K Poulose <suzuki.poulose@....com>
Subject: Re: [PATCH v2] perf parse: Copy string to perf_evsel_config_term

On Tue, Jan 07, 2020 at 10:16:09AM +0100, Jiri Olsa wrote:

[...]

> > diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
> > index ed7c008b9c8b..49b26504bee3 100644
> > --- a/tools/perf/util/parse-events.c
> > +++ b/tools/perf/util/parse-events.c
> > @@ -1220,7 +1220,6 @@ static int get_config_terms(struct list_head *head_config,
> >  			    struct list_head *head_terms __maybe_unused)
> >  {
> >  #define ADD_CONFIG_TERM(__type, __name, __val)			\
> > -do {								\
> >  	struct perf_evsel_config_term *__t;			\
> >  								\
> >  	__t = zalloc(sizeof(*__t));				\
> > @@ -1229,9 +1228,23 @@ do {								\
> >  								\
> >  	INIT_LIST_HEAD(&__t->list);				\
> >  	__t->type       = PERF_EVSEL__CONFIG_TERM_ ## __type;	\
> > -	__t->val.__name = __val;				\
> >  	__t->weak	= term->weak;				\
> > -	list_add_tail(&__t->list, head_terms);			\
> > +	list_add_tail(&__t->list, head_terms)
> > +
> > +#define ADD_CONFIG_TERM_VAL(__type, __name, __val)		\
> > +do {								\
> > +	ADD_CONFIG_TERM(__type, __name, __val);			\
> > +	__t->val.__name = __val;				\
> > +} while (0)
> > +
> > +#define ADD_CONFIG_TERM_STR(__type, __name, __val)		\
> > +do {								\
> > +	ADD_CONFIG_TERM(__type, __name, __val);			\
> > +	__t->val.__name = strdup(__val);			\
> > +	if (!__t->val.__name) {					\
> > +		zfree(&__t);					\
> > +		return -ENOMEM;					\
> > +	}							\
> >  } while (0)
> 
> hum, I did not check yesterday how we release perf_evsel_config_term
> objects, but looks like now we need to release those pointers in here:
>   perf_evsel__free_config_terms

My bad!  I did some check for releasing but missed this function.

Will spin a new patch for this.  Since '__t->val' is an union type, so
for the releasing, I think we need to use below code.

Please let me know if this is okay for you?

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index a69e64236120..fc659cdbd3ce 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -1264,7 +1264,19 @@ static void perf_evsel__free_config_terms(struct evsel *evsel)
        struct perf_evsel_config_term *term, *h;
 
        list_for_each_entry_safe(term, h, &evsel->config_terms, list) {
+               int type = term->type;
+
                list_del_init(&term->list);
+
+               if (type == PARSE_EVENTS__TERM_TYPE_CALLGRAPH)
+                       zfree(&term->val.callgraph);
+
+               if (type == PARSE_EVENTS__TERM_TYPE_BRANCH_SAMPLE_TYPE)
+                       zfree(&term->val.branch);
+
+               if (type == PARSE_EVENTS__TERM_TYPE_DRV_CFG)
+                       zfree(&term->val.drv_cfg);
+
                free(term);
        }
 }

Thanks,
Leo