From patchwork Sat May 22 08:18:34 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Julia Lawall X-Patchwork-Id: 53236 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 5E379B7D20 for ; Sat, 22 May 2010 18:18:59 +1000 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753243Ab0EVISn (ORCPT ); Sat, 22 May 2010 04:18:43 -0400 Received: from mgw1.diku.dk ([130.225.96.91]:60181 "EHLO mgw1.diku.dk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752334Ab0EVISk (ORCPT ); Sat, 22 May 2010 04:18:40 -0400 Received: from localhost (localhost [127.0.0.1]) by mgw1.diku.dk (Postfix) with ESMTP id DCCBC52C5D2; Sat, 22 May 2010 10:18:38 +0200 (CEST) Received: from mgw1.diku.dk ([127.0.0.1]) by localhost (mgw1.diku.dk [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id pPqbj9-Jrwso; Sat, 22 May 2010 10:18:34 +0200 (CEST) Received: from nhugin.diku.dk (nhugin.diku.dk [130.225.96.140]) by mgw1.diku.dk (Postfix) with ESMTP id 594BB52C5D0; Sat, 22 May 2010 10:18:34 +0200 (CEST) Received: from ask.diku.dk (ask.diku.dk [130.225.96.225]) by nhugin.diku.dk (Postfix) with ESMTP id 59EBF6DFD0B; Sat, 22 May 2010 10:11:14 +0200 (CEST) Received: by ask.diku.dk (Postfix, from userid 3767) id 1BEDA200BD; Sat, 22 May 2010 10:18:34 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by ask.diku.dk (Postfix) with ESMTP id 11578200BB; Sat, 22 May 2010 10:18:34 +0200 (CEST) Date: Sat, 22 May 2010 10:18:34 +0200 (CEST) From: Julia Lawall To: Oliver Hartkopp , Urs Thuermann , "David S. Miller" , socketcan-core@lists.berlios.de, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org Subject: [PATCH 1/27] net/can: Use memdup_user Message-ID: MIME-Version: 1.0 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Julia Lawall Use memdup_user when user data is immediately copied into the allocated region. The semantic patch that makes this change is as follows: (http://coccinelle.lip6.fr/) // @@ expression from,to,size,flag; position p; identifier l1,l2; @@ - to = \(kmalloc@p\|kzalloc@p\)(size,flag); + to = memdup_user(from,size); if ( - to==NULL + IS_ERR(to) || ...) { <+... when != goto l1; - -ENOMEM + PTR_ERR(to) ...+> } - if (copy_from_user(to, from, size) != 0) { - <+... when != goto l2; - -EFAULT - ...+> - } // Signed-off-by: Julia Lawall --- net/can/raw.c | 11 +++-------- 1 file changed, 3 insertions(+), 8 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/net/can/raw.c b/net/can/raw.c index da99cf1..ccfe633 100644 --- a/net/can/raw.c +++ b/net/can/raw.c @@ -436,14 +436,9 @@ static int raw_setsockopt(struct socket *sock, int level, int optname, if (count > 1) { /* filter does not fit into dfilter => alloc space */ - filter = kmalloc(optlen, GFP_KERNEL); - if (!filter) - return -ENOMEM; - - if (copy_from_user(filter, optval, optlen)) { - kfree(filter); - return -EFAULT; - } + filter = memdup_user(optval, optlen); + if (IS_ERR(filter)) + return PTR_ERR(filter); } else if (count == 1) { if (copy_from_user(&sfilter, optval, sizeof(sfilter))) return -EFAULT;