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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 D3C09C2D0DB for ; Tue, 28 Jan 2020 14:40:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A84022173E for ; Tue, 28 Jan 2020 14:40:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1580222457; bh=N0+TqitR6x8SaBnWZM8XYV12zZUenDlfzoRwwjLj6Ag=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=K3uAXSGxh6Xil/zpZf4G1gCdbU0aCOMpMy0QOmlkfl1nOLEwOTvL+2AEcfwggAiya pVkmNOpOmjoKU216XLhthuaEvnRFtl4dzrq3ru+mx1xG9U7N68v+Mz0yFcv6MtnysZ 0qkjNCHvrn+4pXf57Cfz/K8RHv0ASANPf3eItcRw= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729946AbgA1OOo (ORCPT ); Tue, 28 Jan 2020 09:14:44 -0500 Received: from mail.kernel.org ([198.145.29.99]:36950 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728183AbgA1OOl (ORCPT ); Tue, 28 Jan 2020 09:14:41 -0500 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 131F224693; Tue, 28 Jan 2020 14:14:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1580220880; bh=N0+TqitR6x8SaBnWZM8XYV12zZUenDlfzoRwwjLj6Ag=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=hLvFb1dWZ3KEKqdFEexmrL9nIanxNKDHdGOVZi2bImuLT5W32BgqyQpbDXpLZBpLE n8nw90ngzBcHwMCELZLooPLplT52VW0+YSghx22GjF0bcljcsQrwEY55FI/1L15Lv5 3q9JQIh/RBK+xB7yg9kbCsFM/RH2zHp6INeZoybA= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, kbuild test robot , Wen Huang , Kalle Valo Subject: [PATCH 4.4 183/183] libertas: Fix two buffer overflows at parsing bss descriptor Date: Tue, 28 Jan 2020 15:06:42 +0100 Message-Id: <20200128135847.988935436@linuxfoundation.org> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200128135829.486060649@linuxfoundation.org> References: <20200128135829.486060649@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: Wen Huang commit e5e884b42639c74b5b57dc277909915c0aefc8bb upstream. add_ie_rates() copys rates without checking the length in bss descriptor from remote AP.when victim connects to remote attacker, this may trigger buffer overflow. lbs_ibss_join_existing() copys rates without checking the length in bss descriptor from remote IBSS node.when victim connects to remote attacker, this may trigger buffer overflow. Fix them by putting the length check before performing copy. This fix addresses CVE-2019-14896 and CVE-2019-14897. This also fix build warning of mixed declarations and code. Reported-by: kbuild test robot Signed-off-by: Wen Huang Signed-off-by: Kalle Valo Signed-off-by: Greg Kroah-Hartman --- drivers/net/wireless/libertas/cfg.c | 16 +++++++++++++--- 1 file changed, 13 insertions(+), 3 deletions(-) --- a/drivers/net/wireless/libertas/cfg.c +++ b/drivers/net/wireless/libertas/cfg.c @@ -272,6 +272,10 @@ add_ie_rates(u8 *tlv, const u8 *ie, int int hw, ap, ap_max = ie[1]; u8 hw_rate; + if (ap_max > MAX_RATES) { + lbs_deb_assoc("invalid rates\n"); + return tlv; + } /* Advance past IE header */ ie += 2; @@ -1783,6 +1787,9 @@ static int lbs_ibss_join_existing(struct struct cmd_ds_802_11_ad_hoc_join cmd; u8 preamble = RADIO_PREAMBLE_SHORT; int ret = 0; + int hw, i; + u8 rates_max; + u8 *rates; lbs_deb_enter(LBS_DEB_CFG80211); @@ -1843,9 +1850,12 @@ static int lbs_ibss_join_existing(struct if (!rates_eid) { lbs_add_rates(cmd.bss.rates); } else { - int hw, i; - u8 rates_max = rates_eid[1]; - u8 *rates = cmd.bss.rates; + rates_max = rates_eid[1]; + if (rates_max > MAX_RATES) { + lbs_deb_join("invalid rates"); + goto out; + } + rates = cmd.bss.rates; for (hw = 0; hw < ARRAY_SIZE(lbs_rates); hw++) { u8 hw_rate = lbs_rates[hw].bitrate / 5; for (i = 0; i < rates_max; i++) {