copy_mm fix:

- If dup_mmap fails we will try to destroy_context before
init_new_context occurs.  Platforms with non-trivial
init_new_context can explode because of this.  The fix
is to invoke init_new_context before dup_mmap.

kernel/fork.c

@@ -387,6 +387,9 @@ static int copy_mm(unsigned long clone_flags, struct task_struct * tsk)
 	if (!mm_init(mm))
 		goto fail_nomem;
 
+	if (init_new_context(tsk,mm))
+		goto free_pt;
+
 	down_write(&oldmm->mmap_sem);
 	retval = dup_mmap(mm);
 	up_write(&oldmm->mmap_sem);
@@ -394,9 +397,6 @@ static int copy_mm(unsigned long clone_flags, struct task_struct * tsk)
 	if (retval)
 		goto free_pt;
 
-	if (init_new_context(tsk,mm))
-		goto free_pt;
-
 good_mm:
 	tsk->mm = mm;
 	tsk->active_mm = mm;