From nobody Mon Sep 15 04:18:44 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 326E3C54EBE for ; Mon, 16 Jan 2023 11:59:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230235AbjAPL7f (ORCPT ); Mon, 16 Jan 2023 06:59:35 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41366 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230341AbjAPL7F (ORCPT ); Mon, 16 Jan 2023 06:59:05 -0500 Received: from szxga02-in.huawei.com (szxga02-in.huawei.com [45.249.212.188]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7F155196A9 for ; Mon, 16 Jan 2023 03:59:04 -0800 (PST) Received: from dggpemm500014.china.huawei.com (unknown [172.30.72.55]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4NwVr33dTNzRrlw; Mon, 16 Jan 2023 19:57:07 +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; Mon, 16 Jan 2023 19:58:56 +0800 From: Wupeng Ma To: CC: , , , , Subject: [PATCH v2 3/4] mm/mempolicy: return EINVAL if len overflows for mbind Date: Mon, 16 Jan 2023 19:58:12 +0800 Message-ID: <20230116115813.2956935-4-mawupeng1@huawei.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230116115813.2956935-1-mawupeng1@huawei.com> References: <20230116115813.2956935-1-mawupeng1@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Originating-IP: [10.175.112.125] X-ClientProxiedBy: dggems703-chm.china.huawei.com (10.3.19.180) 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 Return -EINVAL if len overflows for mbind. Signed-off-by: Ma Wupeng --- mm/mempolicy.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 153fda1ebb9c..4cb19a6e368b 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -1258,6 +1258,7 @@ static long do_mbind(unsigned long start, unsigned lo= ng len, nodemask_t *nmask, unsigned long flags) { struct mm_struct *mm =3D current->mm; + unsigned long old_len =3D len; struct mempolicy *new; unsigned long end; int err; @@ -1278,7 +1279,7 @@ static long do_mbind(unsigned long start, unsigned lo= ng len, len =3D PAGE_ALIGN(len); end =3D start + len; =20 - if (end < start) + if (end < start || (old_len !=3D 0 && len =3D=3D 0)) return -EINVAL; if (end =3D=3D start) return 0; --=20 2.25.1