From patchwork Mon Jan 18 13:33:10 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "tianjia.zhang" X-Patchwork-Id: 365778 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, UNPARSEABLE_RELAY, USER_AGENT_GIT autolearn=ham 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 2B0A6C433E0 for ; Mon, 18 Jan 2021 13:51:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E1B4022B49 for ; Mon, 18 Jan 2021 13:51:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390538AbhARNvU (ORCPT ); Mon, 18 Jan 2021 08:51:20 -0500 Received: from out30-130.freemail.mail.aliyun.com ([115.124.30.130]:40318 "EHLO out30-130.freemail.mail.aliyun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2392291AbhARNeH (ORCPT ); Mon, 18 Jan 2021 08:34:07 -0500 X-Alimail-AntiSpam: AC=PASS; BC=-1|-1; BR=01201311R201e4; CH=green; DM=||false|; DS=||; FP=0|-1|-1|-1|0|-1|-1|-1; HT=e01e04423; MF=tianjia.zhang@linux.alibaba.com; NM=1; PH=DS; RN=16; SR=0; TI=SMTPD_---0UM8540F_1610976790; Received: from localhost(mailfrom:tianjia.zhang@linux.alibaba.com fp:SMTPD_---0UM8540F_1610976790) by smtp.aliyun-inc.com(127.0.0.1); Mon, 18 Jan 2021 21:33:10 +0800 From: Tianjia Zhang To: Jarkko Sakkinen , Thomas Gleixner , Ingo Molnar , Borislav Petkov , "H. Peter Anvin" , Andrew Morton , Shuah Khan , haitao.huang@intel.com, Kai Huang , x86@kernel.org, linux-sgx@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, Jia Zhang Cc: Tianjia Zhang Subject: [PATCH] mm: Optimizing error condition detection in do_mprotect_pkey() Date: Mon, 18 Jan 2021 21:33:10 +0800 Message-Id: <20210118133310.98375-1-tianjia.zhang@linux.alibaba.com> X-Mailer: git-send-email 2.19.1.3.ge56e4f7 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Obviously, the error variable detection of the if statement is for the mprotect callback function, so it is also put into the scope of calling callbck. Reported-by: Jia Zhang Signed-off-by: Tianjia Zhang --- mm/mprotect.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/mm/mprotect.c b/mm/mprotect.c index ab709023e9aa..94188df1ee55 100644 --- a/mm/mprotect.c +++ b/mm/mprotect.c @@ -617,10 +617,11 @@ static int do_mprotect_pkey(unsigned long start, size_t len, if (tmp > end) tmp = end; - if (vma->vm_ops && vma->vm_ops->mprotect) + if (vma->vm_ops && vma->vm_ops->mprotect) { error = vma->vm_ops->mprotect(vma, nstart, tmp, newflags); - if (error) - goto out; + if (error) + goto out; + } error = mprotect_fixup(vma, &prev, nstart, tmp, newflags); if (error)