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=-10.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 7C268C433E0 for ; Thu, 30 Jul 2020 08:05:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4F136206C0 for ; Thu, 30 Jul 2020 08:05:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1596096349; bh=L3Zw8ss3VmWopi7gORgZBBtYTkCV0QdjwK+a37qoRaw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=JkmVIhkAP0Xwg5Q9WZVlUmH54YsglVji/FIzQkCScIrDHiDHeU//qfV6LpIUKW7oT v2rGLeWLd2MTzsI9zGtdJEcHoZpugdmKQh8dk3ECgVHMqghMgg2yfnPJst214uYQ0M B2utLLv//LwXNdLOalM1foit3nAswE+iXf8p3gnc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729211AbgG3IFs (ORCPT ); Thu, 30 Jul 2020 04:05:48 -0400 Received: from mail.kernel.org ([198.145.29.99]:42990 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729193AbgG3IFm (ORCPT ); Thu, 30 Jul 2020 04:05:42 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id C243620656; Thu, 30 Jul 2020 08:05:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1596096342; bh=L3Zw8ss3VmWopi7gORgZBBtYTkCV0QdjwK+a37qoRaw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Ax1dOrcIEC5kYnV0G5Aopt3RGkpyqwQJtoM8ogVEdTyQeDRK4/Xim8PdjgG0aa+xa Krp94BpHwTX/H1qlhTwJpS1j30j+XTBqBIU07zJ5MUSSAXQ4a7h/yzWuJyg85bAnrf t60ToYK75y8Hk7sjT8gMFvQ/4xM9DW3FktNey+eg= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Dan Carpenter , "David S. Miller" Subject: [PATCH 5.4 12/19] AX.25: Prevent integer overflows in connect and sendmsg Date: Thu, 30 Jul 2020 10:04:14 +0200 Message-Id: <20200730074421.116783315@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200730074420.502923740@linuxfoundation.org> References: <20200730074420.502923740@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Dan Carpenter [ Upstream commit 17ad73e941b71f3bec7523ea4e9cbc3752461c2d ] 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 Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/ax25/af_ax25.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) --- a/net/ax25/af_ax25.c +++ b/net/ax25/af_ax25.c @@ -1188,6 +1188,7 @@ static int __must_check ax25_connect(str 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 *s 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;