mm: fix NULL ptr dereference in migrate_pages

[uclinux-h8/linux.git] / mm / mempolicy.c

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index cfb6c86..b195691 100644 (file)
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -1361,11 +1361,14 @@ SYSCALL_DEFINE4(migrate_pages, pid_t, pid, unsigned long, maxnode,
 
        mm = get_task_mm(task);
        put_task_struct(task);
-       if (mm)
-               err = do_migrate_pages(mm, old, new,
-                       capable(CAP_SYS_NICE) ? MPOL_MF_MOVE_ALL : MPOL_MF_MOVE);
-       else
+
+       if (!mm) {
                err = -EINVAL;
+               goto out;
+       }
+
+       err = do_migrate_pages(mm, old, new,
+               capable(CAP_SYS_NICE) ? MPOL_MF_MOVE_ALL : MPOL_MF_MOVE);
 
        mmput(mm);
 out: