[PATCH v2] selftests/lsm: Fix memory leak in attr_lsm_count

[Wang Yan <wangyan01@kylinos.cn>]

The calloc-allocated buffer in attr_lsm_count() is never released on
any exit path, including both the normal return path and the early
return when read_sysfs_lsms fails, resulting in a heap memory leak.

Add free() for the buffer on all return branches to fix the leak.

Fixes: d3d929a8b0cd ("LSM: selftests for Linux Security Module syscalls")
Signed-off-by: Wang Yan <wangyan01@kylinos.cn>
---
 tools/testing/selftests/lsm/common.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/lsm/common.c b/tools/testing/selftests/lsm/common.c
index 9ad258912646..927dce4f04cb 100644
--- a/tools/testing/selftests/lsm/common.c
+++ b/tools/testing/selftests/lsm/common.c
@@ -76,7 +76,7 @@ int attr_lsm_count(void)
 		return 0;
 
 	if (read_sysfs_lsms(names, sysconf(_SC_PAGESIZE)))
-		return 0;
+		goto out;
 
 	if (strstr(names, "selinux"))
 		count++;
@@ -85,5 +85,7 @@ int attr_lsm_count(void)
 	if (strstr(names, "apparmor"))
 		count++;
 
+out:
+	free(names);
 	return count;
 }
-- 
2.25.1