[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 <zhujun2@xxxxxxxxxxxxxxxxxxxx>
---
 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