diff --git a/mm/migrate.c b/mm/migrate.c
index 4cf1af88c1dd..5ca5842df5db 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1864,6 +1864,53 @@ static int do_pages_stat(struct mm_struct *mm, unsigned long nr_pages,
 	return nr_pages ? -EFAULT : 0;
 }
 
+static struct mm_struct *find_mm_struct(pid_t pid, nodemask_t *mem_nodes)
+{
+	struct task_struct *task;
+	struct mm_struct *mm;
+
+	/*
+	 * There is no need to check if current process has the right to modify
+	 * the specified process when they are same.
+	 */
+	if (!pid) {
+		mmget(current->mm);
+		*mem_nodes = cpuset_mems_allowed(current);
+		return current->mm;
+	}
+
+	/* Find the mm_struct */
+	rcu_read_lock();
+	task = find_task_by_vpid(pid);
+	if (!task) {
+		rcu_read_unlock();
+		return ERR_PTR(-ESRCH);
+	}
+	get_task_struct(task);
+
+	/*
+	 * Check if this process has the right to modify the specified
+	 * process. Use the regular "ptrace_may_access()" checks.
+	 */
+	if (!ptrace_may_access(task, PTRACE_MODE_READ_REALCREDS)) {
+		rcu_read_unlock();
+		mm = ERR_PTR(-EPERM);
+		goto out;
+	}
+	rcu_read_unlock();
+
+	mm = ERR_PTR(security_task_movememory(task));
+	if (IS_ERR(mm))
+		goto out;
+	*mem_nodes = cpuset_mems_allowed(task);
+	mm = get_task_mm(task);
+out:
+	put_task_struct(task);
+	if (!mm)
+		mm = ERR_PTR(-EINVAL);
+	return mm;
+}
+
 /*
  * Move a list of pages in the address space of the currently executing
  * process.
@@ -1873,7 +1920,6 @@ static int kernel_move_pages(pid_t pid, unsigned long nr_pages,
 			     const int __user *nodes,
 			     int __user *status, int flags)
 {
-	struct task_struct *task;
 	struct mm_struct *mm;
 	int err;
 	nodemask_t task_nodes;
@@ -1885,36 +1931,9 @@ static int kernel_move_pages(pid_t pid, unsigned long nr_pages,
 	if ((flags & MPOL_MF_MOVE_ALL) && !capable(CAP_SYS_NICE))
 		return -EPERM;
 
-	/* Find the mm_struct */
-	rcu_read_lock();
-	task = pid ? find_task_by_vpid(pid) : current;
-	if (!task) {
-		rcu_read_unlock();
-		return -ESRCH;
-	}
-	get_task_struct(task);
-
-	/*
-	 * Check if this process has the right to modify the specified
-	 * process. Use the regular "ptrace_may_access()" checks.
-	 */
-	if (!ptrace_may_access(task, PTRACE_MODE_READ_REALCREDS)) {
-		rcu_read_unlock();
-		err = -EPERM;
-		goto out;
-	}
-	rcu_read_unlock();
-
- 	err = security_task_movememory(task);
- 	if (err)
-		goto out;
-
-	task_nodes = cpuset_mems_allowed(task);
-	mm = get_task_mm(task);
-	put_task_struct(task);
-
-	if (!mm)
-		return -EINVAL;
+	mm = find_mm_struct(pid, &task_nodes);
+	if (IS_ERR(mm))
+		return PTR_ERR(mm);
 
 	if (nodes)
 		err = do_pages_move(mm, task_nodes, nr_pages, pages,
@@ -1924,10 +1943,6 @@ static int kernel_move_pages(pid_t pid, unsigned long nr_pages,
 
 	mmput(mm);
 	return err;
-
-out:
-	put_task_struct(task);
-	return err;
 }
 
 SYSCALL_DEFINE6(move_pages, pid_t, pid, unsigned long, nr_pages,