From patchwork Sat May 22 08:18:59 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Julia Lawall X-Patchwork-Id: 53237 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 79DD1B7D2E for ; Sat, 22 May 2010 18:19:45 +1000 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753568Ab0EVITJ (ORCPT ); Sat, 22 May 2010 04:19:09 -0400 Received: from mgw1.diku.dk ([130.225.96.91]:60205 "EHLO mgw1.diku.dk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752481Ab0EVITE (ORCPT ); Sat, 22 May 2010 04:19:04 -0400 Received: from localhost (localhost [127.0.0.1]) by mgw1.diku.dk (Postfix) with ESMTP id A54CD52C5D0; Sat, 22 May 2010 10:19:03 +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 UeIXTzj+eJhB; Sat, 22 May 2010 10:18:59 +0200 (CEST) Received: from nhugin.diku.dk (nhugin.diku.dk [130.225.96.140]) by mgw1.diku.dk (Postfix) with ESMTP id 3623952C5D4; Sat, 22 May 2010 10:18:59 +0200 (CEST) Received: from ask.diku.dk (ask.diku.dk [130.225.96.225]) by nhugin.diku.dk (Postfix) with ESMTP id 392CB6DFB7A; Sat, 22 May 2010 10:11:39 +0200 (CEST) Received: by ask.diku.dk (Postfix, from userid 3767) id 178E2200BD; Sat, 22 May 2010 10:18:59 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by ask.diku.dk (Postfix) with ESMTP id 0E1B3200BB; Sat, 22 May 2010 10:18:59 +0200 (CEST) Date: Sat, 22 May 2010 10:18:59 +0200 (CEST) From: Julia Lawall To: Paul Mackerras , linux-ppp@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org Subject: [PATCH 2/27] drivers/net: 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 --- drivers/net/ppp_generic.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/drivers/net/ppp_generic.c b/drivers/net/ppp_generic.c index 5441688..da7943d 100644 --- a/drivers/net/ppp_generic.c +++ b/drivers/net/ppp_generic.c @@ -539,14 +539,9 @@ static int get_filter(void __user *arg, struct sock_filter **p) } len = uprog.len * sizeof(struct sock_filter); - code = kmalloc(len, GFP_KERNEL); - if (code == NULL) - return -ENOMEM; - - if (copy_from_user(code, uprog.filter, len)) { - kfree(code); - return -EFAULT; - } + code = memdup_user(uprog.filter, len); + if (IS_ERR(code)) + return PTR_ERR(code); err = sk_chk_filter(code, uprog.len); if (err) {