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=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,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 AB079C2D0DA for ; Fri, 27 Dec 2019 18:14:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 85B6721744 for ; Fri, 27 Dec 2019 18:14:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1577470479; bh=htFu0h7MnxuTbn86aRRG0Y/vLwjJXBBQsUNcpcYgA8E=; h=From:To:Cc:Subject:Date:List-ID:From; b=jawx+pjoweuxaFBWK/gNlGf/S1FyluUVuVGTUkwPvN692kpgEYHsLk90rTq6FOi0z jFvdXF3TXEgcrvHtCu55lK22sGLESOMTxuiEc2eE6XerqbaSfFejC+0nxury05chWf hi6c34XG56/k0cNvc+tFVOqs+haXe/jBwwBbIXQs= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727156AbfL0SOi (ORCPT ); Fri, 27 Dec 2019 13:14:38 -0500 Received: from mail.kernel.org ([198.145.29.99]:38782 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726495AbfL0SOi (ORCPT ); Fri, 27 Dec 2019 13:14:38 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id A512820722; Fri, 27 Dec 2019 18:14:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1577470477; bh=htFu0h7MnxuTbn86aRRG0Y/vLwjJXBBQsUNcpcYgA8E=; h=From:To:Cc:Subject:Date:From; b=dsaYOgPYcxRA00fQHIPa9oliYdHQVTJYQJ9dZg5UYZxrfUKSnEB2pNjzlVhU+Vgv8 UG15a+RMlh/aTWdh7BGhIunAWGEFB3AT4oGu3zVbZUNJlavzwjsT11EsZuWg4UxswN oCaV8khsGJF9q87JYPlH+QCoBFwaK+AMH0TvfmTQ= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Ganapathi Bhat , huangwen , Kalle Valo , Sasha Levin , linux-wireless@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH AUTOSEL 4.9 01/38] mwifiex: fix possible heap overflow in mwifiex_process_country_ie() Date: Fri, 27 Dec 2019 13:13:58 -0500 Message-Id: <20191227181435.7644-1-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Ganapathi Bhat [ Upstream commit 3d94a4a8373bf5f45cf5f939e88b8354dbf2311b ] mwifiex_process_country_ie() function parse elements of bss descriptor in beacon packet. When processing WLAN_EID_COUNTRY element, there is no upper limit check for country_ie_len before calling memcpy. The destination buffer domain_info->triplet is an array of length MWIFIEX_MAX_TRIPLET_802_11D(83). The remote attacker can build a fake AP with the same ssid as real AP, and send malicous beacon packet with long WLAN_EID_COUNTRY elemen (country_ie_len > 83). Attacker can force STA connect to fake AP on a different channel. When the victim STA connects to fake AP, will trigger the heap buffer overflow. Fix this by checking for length and if found invalid, don not connect to the AP. This fix addresses CVE-2019-14895. Reported-by: huangwen Signed-off-by: Ganapathi Bhat Signed-off-by: Kalle Valo Signed-off-by: Sasha Levin --- drivers/net/wireless/marvell/mwifiex/sta_ioctl.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/marvell/mwifiex/sta_ioctl.c b/drivers/net/wireless/marvell/mwifiex/sta_ioctl.c index 478885afb6c6..be3be7a63cf0 100644 --- a/drivers/net/wireless/marvell/mwifiex/sta_ioctl.c +++ b/drivers/net/wireless/marvell/mwifiex/sta_ioctl.c @@ -271,6 +271,14 @@ static int mwifiex_process_country_ie(struct mwifiex_private *priv, "11D: skip setting domain info in FW\n"); return 0; } + + if (country_ie_len > + (IEEE80211_COUNTRY_STRING_LEN + MWIFIEX_MAX_TRIPLET_802_11D)) { + mwifiex_dbg(priv->adapter, ERROR, + "11D: country_ie_len overflow!, deauth AP\n"); + return -EINVAL; + } + memcpy(priv->adapter->country_code, &country_ie[2], 2); domain_info->country_code[0] = country_ie[2]; @@ -314,8 +322,9 @@ int mwifiex_bss_start(struct mwifiex_private *priv, struct cfg80211_bss *bss, priv->scan_block = false; if (bss) { - if (adapter->region_code == 0x00) - mwifiex_process_country_ie(priv, bss); + if (adapter->region_code == 0x00 && + mwifiex_process_country_ie(priv, bss)) + return -EINVAL; /* Allocate and fill new bss descriptor */ bss_desc = kzalloc(sizeof(struct mwifiex_bssdescriptor), -- 2.20.1