[PATCH v2 3/9] perf tools: ensure config and str in terms are unique

[Ian Rogers]

Make it easier to release memory associated with parse event terms by
duplicating the string for the config name and ensuring the val string
is a duplicate.

Signed-off-by: Ian Rogers <irogers@xxxxxxxxxx>
---
 tools/perf/util/parse-events.c | 33 ++++++++++++++++++++++++---------
 tools/perf/util/parse-events.y |  4 +++-
 2 files changed, 27 insertions(+), 10 deletions(-)

diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index a8f8801bd127..f7c8d0853d71 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -1424,7 +1424,6 @@ int parse_events_add_pmu(struct parse_events_state *parse_state,
 int parse_events_multi_pmu_add(struct parse_events_state *parse_state,
 			       char *str, struct list_head **listp)
 {
-	struct list_head *head;
 	struct parse_events_term *term;
 	struct list_head *list;
 	struct perf_pmu *pmu = NULL;
@@ -1441,19 +1440,30 @@ int parse_events_multi_pmu_add(struct parse_events_state *parse_state,
 
 		list_for_each_entry(alias, &pmu->aliases, list) {
 			if (!strcasecmp(alias->name, str)) {
+				struct list_head *head;
+				char *config;
+
 				head = malloc(sizeof(struct list_head));
 				if (!head)
 					return -1;
 				INIT_LIST_HEAD(head);
-				if (parse_events_term__num(&term, PARSE_EVENTS__TERM_TYPE_USER,
-							   str, 1, false, &str, NULL) < 0)
+				config = strdup(str);
+				if (!config)
+					return -1;
+				if (parse_events_term__num(&term,
+						   PARSE_EVENTS__TERM_TYPE_USER,
+						   config, 1, false, &config,
+						   NULL) < 0) {
+					free(list);
+					free(config);
 					return -1;
+				}
 				list_add_tail(&term->list, head);
 
 				if (!parse_events_add_pmu(parse_state, list,
 							  pmu->name, head,
 							  true, true)) {
-					pr_debug("%s -> %s/%s/\n", str,
+					pr_debug("%s -> %s/%s/\n", config,
 						 pmu->name, alias->str);
 					ok++;
 				}
@@ -1462,8 +1472,10 @@ int parse_events_multi_pmu_add(struct parse_events_state *parse_state,
 			}
 		}
 	}
-	if (!ok)
+	if (!ok) {
+		free(list);
 		return -1;
+	}
 	*listp = list;
 	return 0;
 }
@@ -2761,13 +2773,13 @@ int parse_events_term__sym_hw(struct parse_events_term **term,
 	struct parse_events_term temp = {
 		.type_val  = PARSE_EVENTS__TERM_TYPE_STR,
 		.type_term = PARSE_EVENTS__TERM_TYPE_USER,
-		.config    = config ?: (char *) "event",
+		.config    = config ?: strdup("event"),
 	};
 
 	BUG_ON(idx >= PERF_COUNT_HW_MAX);
 	sym = &event_symbols_hw[idx];
 
-	return new_term(term, &temp, (char *) sym->symbol, 0);
+	return new_term(term, &temp, strdup(sym->symbol), 0);
 }
 
 int parse_events_term__clone(struct parse_events_term **new,
@@ -2776,12 +2788,15 @@ int parse_events_term__clone(struct parse_events_term **new,
 	struct parse_events_term temp = {
 		.type_val  = term->type_val,
 		.type_term = term->type_term,
-		.config    = term->config,
+		.config    = term->config ? strdup(term->config) : NULL,
 		.err_term  = term->err_term,
 		.err_val   = term->err_val,
 	};
 
-	return new_term(new, &temp, term->val.str, term->val.num);
+	if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM)
+		return new_term(new, &temp, NULL, term->val.num);
+	else
+		return new_term(new, &temp, strdup(term->val.str), 0);
 }
 
 int parse_events_copy_term_list(struct list_head *old,
diff --git a/tools/perf/util/parse-events.y b/tools/perf/util/parse-events.y
index 48126ae4cd13..27d6b187c9b1 100644
--- a/tools/perf/util/parse-events.y
+++ b/tools/perf/util/parse-events.y
@@ -644,9 +644,11 @@ PE_NAME array '=' PE_VALUE
 PE_DRV_CFG_TERM
 {
 	struct parse_events_term *term;
+	char *config = strdup($1);
 
+	ABORT_ON(!config);
 	ABORT_ON(parse_events_term__str(&term, PARSE_EVENTS__TERM_TYPE_DRV_CFG,
-					$1, $1, &@1, NULL));
+					config, $1, &@1, NULL));
 	$$ = term;
 }
 
-- 
2.23.0.866.gb869b98d4c-goog