From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, UNPARSEABLE_RELAY autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8CA96C433DF for ; Thu, 23 Jul 2020 14:50:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 635FC20709 for ; Thu, 23 Jul 2020 14:50:27 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="OFlBu+Zy" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728265AbgGWOu0 (ORCPT ); Thu, 23 Jul 2020 10:50:26 -0400 Received: from userp2120.oracle.com ([156.151.31.85]:35396 "EHLO userp2120.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726761AbgGWOu0 (ORCPT ); Thu, 23 Jul 2020 10:50:26 -0400 Received: from pps.filterd (userp2120.oracle.com [127.0.0.1]) by userp2120.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 06NElNDp100901; Thu, 23 Jul 2020 14:50:07 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=date : from : to : cc : subject : message-id : mime-version : content-type : in-reply-to; s=corp-2020-01-29; bh=jykVeaaj1de3HdC9bQbpFC12yVlqXQBg90kokCdh8VM=; b=OFlBu+ZyA5PUaIeiOHa/OCO2esXfYFSgbTbN/iF6x97HEwumrDf9+IkqKtNqXm/GYFv5 e8ugZFFlFLyXTwGS+s2/86DvWT+5baDMN0wmlm0U5VUKOUjH+oCXl5hLdJfOvIkPTWcf TSB1DboGbimlTcmNuiJNxfR+nuNVh35WU4yYWGfg+MYkHsz/O75pjf548HXsDnmaZhYr 5m1QJa+aP7FOOaGmDIuisacRMNHHOfKAwxxMFVwAezt+53XE13aUNLg71ouzVwJriKJf xyAmSX7cj8uSsyrSO9/ZEtOViSQTmaYVay+M9qtnWjcSVdvwFEbepHt9sp0dmdfzC4xK ew== Received: from aserp3030.oracle.com (aserp3030.oracle.com [141.146.126.71]) by userp2120.oracle.com with ESMTP id 32d6ksx1vg-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Thu, 23 Jul 2020 14:50:07 +0000 Received: from pps.filterd (aserp3030.oracle.com [127.0.0.1]) by aserp3030.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 06NEgOuI144883; Thu, 23 Jul 2020 14:50:06 GMT Received: from aserv0121.oracle.com (aserv0121.oracle.com [141.146.126.235]) by aserp3030.oracle.com with ESMTP id 32fc4qhqep-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 23 Jul 2020 14:50:06 +0000 Received: from abhmp0019.oracle.com (abhmp0019.oracle.com [141.146.116.25]) by aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id 06NEo5ko012251; Thu, 23 Jul 2020 14:50:05 GMT Received: from mwanda (/41.57.98.10) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Thu, 23 Jul 2020 14:50:05 +0000 Date: Thu, 23 Jul 2020 17:49:57 +0300 From: Dan Carpenter To: Joerg Reuter , Peilin Ye Cc: Ralf Baechle , "David S. Miller" , Jakub Kicinski , linux-hams@vger.kernel.org, netdev@vger.kernel.org, gregkh@linuxfoundation.org, syzkaller-bugs@googlegroups.com, linux-kernel-mentees@lists.linuxfoundation.org Subject: [PATCH net] AX.25: Prevent integer overflows in connect and sendmsg Message-ID: <20200723144957.GA293102@mwanda> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200722.175714.1713497446730685740.davem@davemloft.net> X-Mailer: git-send-email haha only kidding X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9690 signatures=668680 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 phishscore=0 malwarescore=0 suspectscore=0 mlxlogscore=999 adultscore=0 spamscore=0 bulkscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2007230110 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9690 signatures=668680 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 malwarescore=0 suspectscore=0 bulkscore=0 mlxscore=0 mlxlogscore=999 impostorscore=0 priorityscore=1501 lowpriorityscore=0 phishscore=0 spamscore=0 adultscore=0 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2007230110 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org We recently added some bounds checking in ax25_connect() and ax25_sendmsg() and we so we removed the AX25_MAX_DIGIS checks because they were no longer required. Unfortunately, I believe they are required to prevent integer overflows so I have added them back. Fixes: 8885bb0621f0 ("AX.25: Prevent out-of-bounds read in ax25_sendmsg()") Fixes: 2f2a7ffad5c6 ("AX.25: Fix out-of-bounds read in ax25_connect()") Signed-off-by: Dan Carpenter --- >From code review. Not tested. It should be harmless though. net/ax25/af_ax25.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/net/ax25/af_ax25.c b/net/ax25/af_ax25.c index 0862fe49d434..dec3f35467c9 100644 --- a/net/ax25/af_ax25.c +++ b/net/ax25/af_ax25.c @@ -1188,6 +1188,7 @@ static int __must_check ax25_connect(struct socket *sock, fsa->fsa_ax25.sax25_ndigis != 0) { /* Valid number of digipeaters ? */ if (fsa->fsa_ax25.sax25_ndigis < 1 || + fsa->fsa_ax25.sax25_ndigis > AX25_MAX_DIGIS || addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * fsa->fsa_ax25.sax25_ndigis) { err = -EINVAL; @@ -1509,7 +1510,9 @@ static int ax25_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) struct full_sockaddr_ax25 *fsa = (struct full_sockaddr_ax25 *)usax; /* Valid number of digipeaters ? */ - if (usax->sax25_ndigis < 1 || addr_len < sizeof(struct sockaddr_ax25) + + if (usax->sax25_ndigis < 1 || + usax->sax25_ndigis > AX25_MAX_DIGIS || + addr_len < sizeof(struct sockaddr_ax25) + sizeof(ax25_address) * usax->sax25_ndigis) { err = -EINVAL; goto out; -- 2.27.0