From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9A007C433E0 for ; Wed, 12 Aug 2020 01:31:19 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 4C190206B2 for ; Wed, 12 Aug 2020 01:31:19 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="bgK0/RUK" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4C190206B2 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux-foundation.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id E72BC6B002B; Tue, 11 Aug 2020 21:31:18 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id DFE356B002C; Tue, 11 Aug 2020 21:31:18 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id CC5B76B002D; Tue, 11 Aug 2020 21:31:18 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0219.hostedemail.com [216.40.44.219]) by kanga.kvack.org (Postfix) with ESMTP id B4BC86B002B for ; Tue, 11 Aug 2020 21:31:18 -0400 (EDT) Received: from smtpin21.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id 7A970248E for ; Wed, 12 Aug 2020 01:31:18 +0000 (UTC) X-FDA: 77140188636.21.anger37_4d055fa26fe7 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin21.hostedemail.com (Postfix) with ESMTP id 5404B180442C2 for ; Wed, 12 Aug 2020 01:31:18 +0000 (UTC) X-HE-Tag: anger37_4d055fa26fe7 X-Filterd-Recvd-Size: 2384 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf06.hostedemail.com (Postfix) with ESMTP for ; Wed, 12 Aug 2020 01:31:17 +0000 (UTC) Received: from localhost.localdomain (c-73-231-172-41.hsd1.ca.comcast.net [73.231.172.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 051AB2076C; Wed, 12 Aug 2020 01:31:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597195877; bh=bx5FthwCPKERZJ6yRP7PlMq2b1WJ53vWktjFq+KwScE=; h=Date:From:To:Subject:In-Reply-To:From; b=bgK0/RUKHO0FJ4Q5iKSCgczSjt0aTKARBMqL7Q141Lydw5zJiRdHUUeIDz6l4aK1w 5M6rTW13zwuKg+Fe9obzO39JgRzVQmDstPUH83i+MmdfoxWuOLIcJtGAlvQo34GRj3 lHp+qZKJLkvvX4WeMkoRbU7zJGjkTP5Ett599c1o= Date: Tue, 11 Aug 2020 18:31:16 -0700 From: Andrew Morton To: akpm@linux-foundation.org, haowenchao22@gmail.com, linux-mm@kvack.org, mm-commits@vger.kernel.org, torvalds@linux-foundation.org Subject: [patch 019/165] mm/mempolicy.c: check parameters first in kernel_get_mempolicy Message-ID: <20200812013116.Bl2q7CRRo%akpm@linux-foundation.org> In-Reply-To: <20200811182949.e12ae9a472e3b5e27e16ad6c@linux-foundation.org> User-Agent: s-nail v14.8.16 X-Rspamd-Queue-Id: 5404B180442C2 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam02 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Wenchao Hao Subject: mm/mempolicy.c: check parameters first in kernel_get_mempolicy Previous implementatoin calls untagged_addr() before error check, while if the error check failed and return EINVAL, the untagged_addr() call is just useless work. Link: http://lkml.kernel.org/r/20200801090825.5597-1-haowenchao22@gmail.com Signed-off-by: Wenchao Hao Reviewed-by: Andrew Morton Signed-off-by: Andrew Morton --- mm/mempolicy.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/mm/mempolicy.c~mm-mempolicy-check-parameters-first-in-kernel_get_mempolicy +++ a/mm/mempolicy.c @@ -1632,11 +1632,11 @@ static int kernel_get_mempolicy(int __us int pval; nodemask_t nodes; - addr = untagged_addr(addr); - if (nmask != NULL && maxnode < nr_node_ids) return -EINVAL; + addr = untagged_addr(addr); + err = do_get_mempolicy(&pval, &nodes, addr, flags); if (err) _