linux-kernel - [PATCH 1/6] perf jevents: Fix leak of mapfile memory

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Message-ID: <1583406486-154841-2-git-send-email-john.garry@huawei.com>
Date:   Thu, 5 Mar 2020 19:08:01 +0800
From:   John Garry <john.garry@...wei.com>
To:     <peterz@...radead.org>, <mingo@...hat.com>, <acme@...nel.org>,
        <mark.rutland@....com>, <alexander.shishkin@...ux.intel.com>,
        <jolsa@...hat.com>, <namhyung@...nel.org>
CC:     <will@...nel.org>, <ak@...ux.intel.com>, <linuxarm@...wei.com>,
        <linux-kernel@...r.kernel.org>, <james.clark@....com>,
        <qiangqing.zhang@....com>, John Garry <john.garry@...wei.com>
Subject: [PATCH 1/6] perf jevents: Fix leak of mapfile memory

The memory for global pointer is never freed during normal program
execution, so let's do that in the main function exit as a good programming
practice.

A stray blank line is also removed.

Reported-by: Jiri Olsa <jolsa@...hat.com>
Signed-off-by: John Garry <john.garry@...wei.com>
---
 tools/perf/pmu-events/jevents.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/tools/perf/pmu-events/jevents.c b/tools/perf/pmu-events/jevents.c
index 079c77b6a2fd..27b4da80f751 100644
--- a/tools/perf/pmu-events/jevents.c
+++ b/tools/perf/pmu-events/jevents.c
@@ -1082,10 +1082,9 @@ static int process_one_file(const char *fpath, const struct stat *sb,
  */
 int main(int argc, char *argv[])
 {
-	int rc;
+	int rc, ret = 0;
 	int maxfds;
 	char ldirname[PATH_MAX];
-
 	const char *arch;
 	const char *output_file;
 	const char *start_dirname;
@@ -1156,7 +1155,8 @@ int main(int argc, char *argv[])
 		/* Make build fail */
 		fclose(eventsfp);
 		free_arch_std_events();
-		return 1;
+		ret = 1;
+		goto out_free_mapfile;
 	} else if (rc) {
 		goto empty_map;
 	}
@@ -1174,14 +1174,17 @@ int main(int argc, char *argv[])
 		/* Make build fail */
 		fclose(eventsfp);
 		free_arch_std_events();
-		return 1;
+		ret = 1;
 	}
 
-	return 0;
+
+	goto out_free_mapfile;
 
 empty_map:
 	fclose(eventsfp);
 	create_empty_mapping(output_file);
 	free_arch_std_events();
-	return 0;
+out_free_mapfile:
+	free(mapfile);
+	return ret;
 }
-- 
2.17.1