From nobody Tue Feb 10 09:11:05 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 54CE0EB64DC for ; Tue, 27 Jun 2023 14:47:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232245AbjF0OrM (ORCPT ); Tue, 27 Jun 2023 10:47:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43810 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231992AbjF0Op5 (ORCPT ); Tue, 27 Jun 2023 10:45:57 -0400 Received: from mail2-relais-roc.national.inria.fr (mail2-relais-roc.national.inria.fr [192.134.164.83]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 391013593; Tue, 27 Jun 2023 07:45:27 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=inria.fr; s=dc; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=1fuBHkuVCLvBAw8MSaPz0+UJaQZjfgmRVP18IwyNeDQ=; b=OThXz5HOfGeTx9GD1nvtvqYG/QJvKBhAtvHz62cnidSYuUWImbYlLedV QyDiCsD4jvF4TDB040IrOhHB/CSeZG4H1P4v4+Zu6HW/zl+fwnSIwGIYT nJ93hxVqPqxEW9Mu1JxrZeFxmha8G4U9oBr7c2HOjcOaDb2Po5/neaAlT Y=; Authentication-Results: mail2-relais-roc.national.inria.fr; dkim=none (message not signed) header.i=none; spf=SoftFail smtp.mailfrom=Julia.Lawall@inria.fr; dmarc=fail (p=none dis=none) d=inria.fr X-IronPort-AV: E=Sophos;i="6.01,162,1684792800"; d="scan'208";a="114936346" Received: from i80.paris.inria.fr (HELO i80.paris.inria.fr.) ([128.93.90.48]) by mail2-relais-roc.national.inria.fr with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 Jun 2023 16:43:53 +0200 From: Julia Lawall To: "Michael S. Tsirkin" Cc: kernel-janitors@vger.kernel.org, keescook@chromium.org, christophe.jaillet@wanadoo.fr, kuba@kernel.org, Jason Wang , Xuan Zhuo , virtualization@lists.linux-foundation.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 23/24] vduse: use vmalloc_array and vcalloc Date: Tue, 27 Jun 2023 16:43:38 +0200 Message-Id: <20230627144339.144478-24-Julia.Lawall@inria.fr> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20230627144339.144478-1-Julia.Lawall@inria.fr> References: <20230627144339.144478-1-Julia.Lawall@inria.fr> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Use vmalloc_array and vcalloc to protect against multiplication overflows. The changes were done using the following Coccinelle semantic patch: // @initialize:ocaml@ @@ let rename alloc =3D match alloc with "vmalloc" -> "vmalloc_array" | "vzalloc" -> "vcalloc" | _ -> failwith "unknown" @@ size_t e1,e2; constant C1, C2; expression E1, E2, COUNT, x1, x2, x3; typedef u8; typedef __u8; type t =3D {u8,__u8,char,unsigned char}; identifier alloc =3D {vmalloc,vzalloc}; fresh identifier realloc =3D script:ocaml(alloc) { rename alloc }; @@ ( alloc(x1*x2*x3) | alloc(C1 * C2) | alloc((sizeof(t)) * (COUNT)) | - alloc((e1) * (e2)) + realloc(e1, e2) | - alloc((e1) * (COUNT)) + realloc(COUNT, e1) | - alloc((E1) * (E2)) + realloc(E1, E2) ) // Signed-off-by: Julia Lawall --- v2: Use vmalloc_array and vcalloc instead of array_size. This also leaves a multiplication of a constant by a sizeof as is. The position of this patch in the series changed accordingly. drivers/vdpa/vdpa_user/iova_domain.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff -u -p a/drivers/vdpa/vdpa_user/iova_domain.c b/drivers/vdpa/vdpa_user/= iova_domain.c --- a/drivers/vdpa/vdpa_user/iova_domain.c +++ b/drivers/vdpa/vdpa_user/iova_domain.c @@ -571,8 +571,8 @@ vduse_domain_create(unsigned long iova_l =20 domain->iova_limit =3D iova_limit; domain->bounce_size =3D PAGE_ALIGN(bounce_size); - domain->bounce_maps =3D vzalloc(bounce_pfns * - sizeof(struct vduse_bounce_map)); + domain->bounce_maps =3D vcalloc(bounce_pfns, + sizeof(struct vduse_bounce_map)); if (!domain->bounce_maps) goto err_map;