linux-kernel - [PATCH next v3 2/2] perf tools: fix potential memleak in perf events parser

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Message-ID: <20200615013614.8646-3-chenwandun@huawei.com>
Date:   Mon, 15 Jun 2020 09:36:14 +0800
From:   Chen Wandun <chenwandun@...wei.com>
To:     <acme@...nel.org>, <linux-kernel@...r.kernel.org>
CC:     <peterz@...radead.org>, <mingo@...hat.com>,
        <Markus.Elfring@....de>, <cj.chengjian@...wei.com>,
        <chenwandun@...wei.com>
Subject: [PATCH next v3 2/2] perf tools: fix potential memleak in perf events parser

Fix potential memory leak. Function new_term may return error, so
it is need to free memory when the return value is negative.
What's more, add jump targets so that a configuration object and
a duplicated string are released after a call of the function
"strdup" or "new_term" failed.

Fixes: b6645a723595 ("perf parse: Ensure config and str in terms are unique")

Signed-off-by: Chen Wandun <chenwandun@...wei.com>
---
 tools/perf/util/parse-events.c | 47 ++++++++++++++++++++++++++--------
 1 file changed, 37 insertions(+), 10 deletions(-)

diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 6f4dc8a92817..a9f32032af08 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");
@@ -2958,12 +2959,23 @@ int parse_events_term__sym_hw(struct parse_events_term **term,
 
 	str = strdup(sym->symbol);
 	if (!str) {
-		if (!config)
-			free(temp.config);
-		return -ENOMEM;
+		ret = -ENOMEM;
+		goto free_config;
 	}
 
-	return new_term(term, &temp, str, 0);
+	ret = new_term(term, &temp, str, 0);
+	if (ret)
+		goto free_str;
+
+	return 0;
+
+free_str:
+	free(str);
+free_config:
+	if (!config)
+		free(temp.config);
+
+	return ret;
 }
 
 int parse_events_term__clone(struct parse_events_term **new,
@@ -2977,23 +2989,38 @@ 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)
+			goto free_config;
+	}
 
 	str = strdup(term->val.str);
 	if (!str) {
-		if (term->config)
-			free(temp.config);
-		return -ENOMEM;
+		ret = -ENOMEM;
+		goto free_config;
 	}
 
-	return new_term(new, &temp, str, 0);
+	ret = new_term(new, &temp, str, 0);
+	if (ret)
+		goto free_str;
+
+	return 0;
+
+free_str:
+	free(str);
+free_config:
+	if (term->config)
+		free(temp.config);
+
+	return ret;
 }
 
 void parse_events_term__delete(struct parse_events_term *term)
-- 
2.17.1