[PATCH] selftests/memfd:Fix a resource leak

[Zhu Jun]

>From a good programming practice perspective, especially in more
complex programs, explicitly freeing allocated memory is a good habit.

Signed-off-by: Zhu Jun <zhuj...@cmss.chinamobile.com>
---
 tools/testing/selftests/memfd/memfd_test.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tools/testing/selftests/memfd/memfd_test.c 
b/tools/testing/selftests/memfd/memfd_test.c
index 95af2d78fd31..f842a4aeb47d 100644
--- a/tools/testing/selftests/memfd/memfd_test.c
+++ b/tools/testing/selftests/memfd/memfd_test.c
@@ -661,9 +661,11 @@ static void mfd_assert_grow_write(int fd)
        l = pwrite(fd, buf, mfd_def_size * 8, 0);
        if (l != (mfd_def_size * 8)) {
                printf("pwrite() failed: %m\n");
+               free(buf);
                abort();
        }
 
+       free(buf);
        mfd_assert_size(fd, mfd_def_size * 8);
 }
 
@@ -685,8 +687,11 @@ static void mfd_fail_grow_write(int fd)
        l = pwrite(fd, buf, mfd_def_size * 8, 0);
        if (l == (mfd_def_size * 8)) {
                printf("pwrite() didn't fail as expected\n");
+               free(buf);
                abort();
        }
+
+       free(buf);
 }
 
 static void mfd_assert_mode(int fd, int mode)
@@ -771,9 +776,11 @@ static pid_t spawn_thread(unsigned int flags, int 
(*fn)(void *), void *arg)
        pid = clone(fn, stack + STACK_SIZE, SIGCHLD | flags, arg);
        if (pid < 0) {
                printf("clone() failed: %m\n");
+               free(stack);
                abort();
        }
 
+       free(stack);
        return pid;
 }
 
-- 
2.17.1