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 B8FB2C38142 for ; Sat, 28 Jan 2023 06:33:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231563AbjA1Gcw (ORCPT ); Sat, 28 Jan 2023 01:32:52 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37928 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230502AbjA1Gcq (ORCPT ); Sat, 28 Jan 2023 01:32:46 -0500 Received: from szxga03-in.huawei.com (szxga03-in.huawei.com [45.249.212.189]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 37372166FA for ; Fri, 27 Jan 2023 22:32:44 -0800 (PST) Received: from dggpemm500014.china.huawei.com (unknown [172.30.72.54]) by szxga03-in.huawei.com (SkyGuard) with ESMTP id 4P3kz26ScqzJqXP; Sat, 28 Jan 2023 14:28:14 +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 14:32:39 +0800 From: Wupeng Ma To: CC: , , , , Subject: [PATCH v3 3/4] mm/mempolicy: return EINVAL if len overflows for mbind Date: Sat, 28 Jan 2023 14:32:28 +0800 Message-ID: <20230128063229.989058-4-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 mbind. 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 85c5d3c2503b..7791be5a2677 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -1275,13 +1275,16 @@ static long do_mbind(unsigned long start, unsigned = long len, if (mode =3D=3D MPOL_DEFAULT) flags &=3D ~MPOL_MF_STRICT; =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; =20 new =3D mpol_new(mode, mode_flags, nmask); if (IS_ERR(new)) --=20 2.25.1