linux-kernel - [PATCH] perf test: add missing free for scandir-returned dirent entities

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Date:   Fri,  9 Jul 2021 18:34:53 +0200
From:   Riccardo Mancini <rickyman7@...il.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Riccardo Mancini <rickyman7@...il.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>, Leo Yan <leo.yan@...aro.org>,
        Remi Bernon <rbernon@...eweavers.com>,
        Fabian Hemmer <copy@...y.sh>, linux-perf-users@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] perf test: add missing free for scandir-returned dirent entities

ASan reported a memory leak for items of the entlist returned from scandir.
In fact, scandir returns a malloc'd array of malloc'd dirents.
This patch adds the missing (z)frees.

Fixes: da963834fe6975a1 ("perf test: Iterate over shell tests in alphabetical order")
Signed-off-by: Riccardo Mancini <rickyman7@...il.com>
---
 tools/perf/tests/builtin-test.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c
index 41e3cf6bb66c68e8..5e6242576236325c 100644
--- a/tools/perf/tests/builtin-test.c
+++ b/tools/perf/tests/builtin-test.c
@@ -26,6 +26,7 @@
 #include <linux/kernel.h>
 #include <linux/string.h>
 #include <subcmd/exec-cmd.h>
+#include <linux/zalloc.h>
 
 static bool dont_fork;
 
@@ -540,7 +541,7 @@ static int shell_tests__max_desc_width(void)
 {
 	struct dirent **entlist;
 	struct dirent *ent;
-	int n_dirs;
+	int n_dirs, e;
 	char path_dir[PATH_MAX];
 	const char *path = shell_tests__dir(path_dir, sizeof(path_dir));
 	int width = 0;
@@ -564,8 +565,9 @@ static int shell_tests__max_desc_width(void)
 		}
 	}
 
+	for (e = 0; e < n_dirs; e++)
+		zfree(&entlist[e]);
 	free(entlist);
-
 	return width;
 }
 
@@ -596,7 +598,7 @@ static int run_shell_tests(int argc, const char *argv[], int i, int width)
 {
 	struct dirent **entlist;
 	struct dirent *ent;
-	int n_dirs;
+	int n_dirs, e;
 	char path_dir[PATH_MAX];
 	struct shell_test st = {
 		.dir = shell_tests__dir(path_dir, sizeof(path_dir)),
@@ -629,6 +631,8 @@ static int run_shell_tests(int argc, const char *argv[], int i, int width)
 		test_and_print(&test, false, -1);
 	}
 
+	for (e = 0; e < n_dirs; e++)
+		zfree(&entlist[e]);
 	free(entlist);
 	return 0;
 }
@@ -730,7 +734,7 @@ static int perf_test__list_shell(int argc, const char **argv, int i)
 {
 	struct dirent **entlist;
 	struct dirent *ent;
-	int n_dirs;
+	int n_dirs, e;
 	char path_dir[PATH_MAX];
 	const char *path = shell_tests__dir(path_dir, sizeof(path_dir));
 
@@ -752,8 +756,11 @@ static int perf_test__list_shell(int argc, const char **argv, int i)
 			continue;
 
 		pr_info("%2d: %s\n", i, t.desc);
+
 	}
 
+	for (e = 0; e < n_dirs; e++)
+		zfree(&entlist[e]);
 	free(entlist);
 	return 0;
 }
-- 
2.23.0