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

[Taeung Song]

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().

Cc: Namhyung Kim <namhy...@kernel.org>
Cc: Jiri Olsa <jo...@redhat.com>
Signed-off-by: Taeung Song <treeze.tae...@gmail.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