From nobody Mon Feb 9 21:22:04 2026 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 882F3C7618A for ; Mon, 20 Mar 2023 02:47:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229837AbjCTCru (ORCPT ); Sun, 19 Mar 2023 22:47:50 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36630 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229639AbjCTCrs (ORCPT ); Sun, 19 Mar 2023 22:47:48 -0400 Received: from szxga08-in.huawei.com (szxga08-in.huawei.com [45.249.212.255]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3CC122069C for ; Sun, 19 Mar 2023 19:47:47 -0700 (PDT) Received: from dggpemm500014.china.huawei.com (unknown [172.30.72.57]) by szxga08-in.huawei.com (SkyGuard) with ESMTP id 4PfzbZ2WnGz17MLK; Mon, 20 Mar 2023 10:44:42 +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 15.1.2507.21; Mon, 20 Mar 2023 10:47:45 +0800 From: Wupeng Ma To: CC: , , , , , Subject: [PATCH v4 3/4] mm/mempolicy: return EINVAL if len overflows for mbind Date: Mon, 20 Mar 2023 10:47:38 +0800 Message-ID: <20230320024739.224850-4-mawupeng1@huawei.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230320024739.224850-1-mawupeng1@huawei.com> References: <20230320024739.224850-1-mawupeng1@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Originating-IP: [10.175.112.125] X-ClientProxiedBy: dggems705-chm.china.huawei.com (10.3.19.182) 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 3a68998adc3a..6b1c45021e48 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -1259,6 +1259,7 @@ 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; @@ -1279,7 +1280,7 @@ 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