selftests/memfd/memfd_test: fix possible NULL pointer dereference

JIRA: https://issues.redhat.com/browse/RHEL-94834

commit 73519de
Author: liuye <liuye@kylinos.cn>
Date:   Tue Jan 14 11:21:15 2025 +0800

    selftests/memfd/memfd_test: fix possible NULL pointer dereference

    If `name' is NULL, a NULL pointer may be accessed in printf.

    Link: https://lkml.kernel.org/r/20250114032115.58638-1-liuye@kylinos.cn
    Signed-off-by: liuye <liuye@kylinos.cn>
    Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
    Cc: Greg Thelen <gthelen@google.com>
    Cc: "Isaac J. Manjarres" <isaacmanjarres@google.com>
    Cc: Jeff Xu <jeffxu@google.com>
    Cc: Saurav Shah <sauravshah.31@gmail.com>
    Cc: Shuah Khan (Samsung OSG) <shuah@kernel.org>
    Signed-off-by: Andrew Morton <akpm@linux-foundation.org>"

Signed-off-by: Joel Savitz <jsavitz@redhat.com>

Author: theyoyojo

tools/testing/selftests/memfd/memfd_test.c

@@ -170,7 +170,7 @@ static void mfd_fail_new(const char *name, unsigned int flags)
 	r = sys_memfd_create(name, flags);
 	if (r >= 0) {
 		printf("memfd_create(\"%s\", %u) succeeded, but failure expected\n",
-		       name, flags);
+		       name ? name : "NULL", flags);
 		close(r);
 		abort();
 	}