[PATCH next] perf tools: fix potential memleak in perf events parser

[Chen Wandun]

Fix potential memory leak in function parse_events_term__sym_hw()
and parse_events_term__clone().

1. Free memory when errors occur.
2. Function new_term may return error, so it is need to free memory
   when the return value is negative.

Signed-off-by: Chen Wandun <chenwan...@huawei.com>
---
 tools/perf/util/parse-events.c | 40 +++++++++++++++++++++++++++++-----
 1 file changed, 34 insertions(+), 6 deletions(-)

diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 3decbb203846..3491c18edd71 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -2947,6 +2947,7 @@ int parse_events_term__sym_hw(struct parse_events_term 
**term,
                .type_term = PARSE_EVENTS__TERM_TYPE_USER,
                .config    = config,
        };
+       int ret;
 
        if (!temp.config) {
                temp.config = strdup("event");
@@ -2957,9 +2958,20 @@ int parse_events_term__sym_hw(struct parse_events_term 
**term,
        sym = &event_symbols_hw[idx];
 
        str = strdup(sym->symbol);
-       if (!str)
+       if (!str) {
+               if (!config)
+                       free(temp.config);
                return -ENOMEM;
-       return new_term(term, &temp, str, 0);
+       }
+
+       ret = new_term(term, &temp, str, 0);
+       if (ret < 0) {
+               free(str);
+               if (!config)
+                       free(temp.config);
+       }
+
+       return ret;
 }
 
 int parse_events_term__clone(struct parse_events_term **new,
@@ -2973,19 +2985,35 @@ int parse_events_term__clone(struct parse_events_term 
**new,
                .err_term  = term->err_term,
                .err_val   = term->err_val,
        };
+       int ret;
 
        if (term->config) {
                temp.config = strdup(term->config);
                if (!temp.config)
                        return -ENOMEM;
        }
-       if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM)
-               return new_term(new, &temp, NULL, term->val.num);
+       if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM) {
+               ret = new_term(new, &temp, NULL, term->val.num);
+               if (ret < 0 && term->config)
+                       free(temp.config);
+               return ret;
+       }
 
        str = strdup(term->val.str);
-       if (!str)
+       if (!str) {
+               if (term->config)
+                       free(temp.config);
                return -ENOMEM;
-       return new_term(new, &temp, str, 0);
+       }
+
+       ret = new_term(new, &temp, str, 0);
+       if (ret < 0) {
+               free(str);
+               if (term->config)
+                       free(temp.config);
+       }
+
+       return ret;
 }
 
 void parse_events_term__delete(struct parse_events_term *term)
-- 
2.17.1