[PATCH] Missing acess_ok() check in aio

BTW, while merging aio from 2.5 to 2.4 and fixing and porting the libaio
(in particular thanks to one of Ben's testcases that was checkin for
this specific case) I found this bug in 2.5

fs/aio.c

@@ -992,7 +992,7 @@ asmlinkage long sys_io_submit(aio_context_t ctx_id, long nr,
 			break;
 		}
 
-		if (unlikely(__copy_from_user(&tmp, user_iocb, sizeof(tmp)))) {
+		if (unlikely(copy_from_user(&tmp, user_iocb, sizeof(tmp)))) {
 			ret = -EFAULT;
 			break;
 		}