mm: fix NULL ptr dereference in move_pages

[cascardo/linux.git] / mm / migrate.c

diff --git a/mm/migrate.c b/mm/migrate.c
index 51c08a0..1107238 100644 (file)
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1388,14 +1388,14 @@ SYSCALL_DEFINE6(move_pages, pid_t, pid, unsigned long, nr_pages,
        mm = get_task_mm(task);
        put_task_struct(task);
 
-       if (mm) {
-               if (nodes)
-                       err = do_pages_move(mm, task_nodes, nr_pages, pages,
-                                           nodes, status, flags);
-               else
-                       err = do_pages_stat(mm, nr_pages, pages, status);
-       } else
-               err = -EINVAL;
+       if (!mm)
+               return -EINVAL;
+
+       if (nodes)
+               err = do_pages_move(mm, task_nodes, nr_pages, pages,
+                                   nodes, status, flags);
+       else
+               err = do_pages_stat(mm, nr_pages, pages, status);
 
        mmput(mm);
        return err;