From nobody Sun Sep 14 01:59:21 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 97632C27C76 for ; Sat, 28 Jan 2023 06:33:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231408AbjA1Gcs (ORCPT ); Sat, 28 Jan 2023 01:32:48 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37896 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229756AbjA1Gcn (ORCPT ); Sat, 28 Jan 2023 01:32:43 -0500 Received: from szxga08-in.huawei.com (szxga08-in.huawei.com [45.249.212.255]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 100F67B408 for ; Fri, 27 Jan 2023 22:32:41 -0800 (PST) Received: from dggpemm500014.china.huawei.com (unknown [172.30.72.53]) by szxga08-in.huawei.com (SkyGuard) with ESMTP id 4P3l1t3mC0z16NJj; Sat, 28 Jan 2023 14:30:42 +0800 (CST) Received: from localhost.localdomain (10.175.112.125) by dggpemm500014.china.huawei.com (7.185.36.153) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.34; Sat, 28 Jan 2023 14:32:38 +0800 From: Wupeng Ma To: CC: , , , , Subject: [PATCH v3 2/4] mm/mempolicy: return EINVAL for if len overflows for set_mempolicy_home_node Date: Sat, 28 Jan 2023 14:32:27 +0800 Message-ID: <20230128063229.989058-3-mawupeng1@huawei.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230128063229.989058-1-mawupeng1@huawei.com> References: <20230128063229.989058-1-mawupeng1@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Originating-IP: [10.175.112.125] X-ClientProxiedBy: dggems702-chm.china.huawei.com (10.3.19.179) To dggpemm500014.china.huawei.com (7.185.36.153) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Ma Wupeng Check and return 0 if len =3D=3D 0 at the beginning of the function. Return -EINVAL if len overflows for set_mempolicy_home_node. Signed-off-by: Ma Wupeng --- mm/mempolicy.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 02c8a712282f..85c5d3c2503b 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -1512,13 +1512,16 @@ SYSCALL_DEFINE4(set_mempolicy_home_node, unsigned l= ong, start, unsigned long, le if (home_node >=3D MAX_NUMNODES || !node_online(home_node)) return -EINVAL; =20 + if (!len) + return 0; + len =3D PAGE_ALIGN(len); - end =3D start + len; + if (!len) + return -EINVAL; =20 + end =3D start + len; if (end < start) return -EINVAL; - if (end =3D=3D start) - return 0; mmap_write_lock(mm); for_each_vma_range(vmi, vma, end) { vmstart =3D max(start, vma->vm_start); --=20 2.25.1