Merge branch 'next' into for-linus

1 files changed, 7 insertions, 2 deletions

diff --git a/mm/migrate.c b/mm/migrate.c
index 037b0967c1e3..21631ab8c08b 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1075,6 +1075,7 @@ asmlinkage long sys_move_pages(pid_t pid, unsigned long nr_pages,
                         const int __user *nodes,
                         int __user *status, int flags)
 {
+        const struct cred *cred = current_cred(), *tcred;
         struct task_struct *task;
         struct mm_struct *mm;
         int err;
@@ -1105,12 +1106,16 @@ asmlinkage long sys_move_pages(pid_t pid, unsigned long nr_pages,
          * capabilities, superuser privileges or the same
          * userid as the target process.
          */
-        if ((current->euid != task->suid) && (current->euid != task->uid) &&
-            (current->uid != task->suid) && (current->uid != task->uid) &&
+        rcu_read_lock();
+        tcred = __task_cred(task);
+        if (cred->euid != tcred->suid && cred->euid != tcred->uid &&
+            cred->uid  != tcred->suid && cred->uid  != tcred->uid &&
             !capable(CAP_SYS_NICE)) {
+                rcu_read_unlock();
                 err = -EPERM;
                 goto out;
         }
+        rcu_read_unlock();
 
         err = security_task_movememory(task);
         if (err)