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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,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 E0423C76195 for ; Thu, 18 Jul 2019 03:16:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B10F021849 for ; Thu, 18 Jul 2019 03:16:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563419816; bh=6Dysk/4iZUohz3iNa9jNhsoWZrOBbYmkX0UlJECQaR0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=n6pHi/8ROi1mVZoCUeGJNV/JkApvnnQATgAc5VU0P5DUhAQB+Dr2oZ3XymPFComH9 3ISlvmZO9uO/fwMTkYoR33gf4+2FCiUL7PbJGMkBy6wOZ32eSlo1Z8jxQswpel74rS TQD0rz4MOsbwQg4Z0wiC83h1+utHtERnfUNQ/ZpU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2391928AbfGRDPB (ORCPT ); Wed, 17 Jul 2019 23:15:01 -0400 Received: from mail.kernel.org ([198.145.29.99]:51590 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2391478AbfGRDPA (ORCPT ); Wed, 17 Jul 2019 23:15:00 -0400 Received: from localhost (115.42.148.210.bf.2iij.net [210.148.42.115]) (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 5B54221855; Thu, 18 Jul 2019 03:14:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563419699; bh=6Dysk/4iZUohz3iNa9jNhsoWZrOBbYmkX0UlJECQaR0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=jxdXETLwCX8X0Q6Kf9u/yOqbI2Sodm1RWnAVTYAZopUTrYSBfNNQA9A7DtTzEOmev C32gjvNT4O0s/ksOA+zexCJ5rcPkD7usX243SVm2NwUQcl50f12D7EpvYcqo1SjGta q/yPI52t1zHlAunNJD9CjjFWEVwfDDgbj80A1uKs= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, huangwen , Takashi Iwai , Kalle Valo , Sasha Levin Subject: [PATCH 4.4 04/40] mwifiex: Fix possible buffer overflows at parsing bss descriptor Date: Thu, 18 Jul 2019 12:02:00 +0900 Message-Id: <20190718030040.494013626@linuxfoundation.org> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20190718030039.676518610@linuxfoundation.org> References: <20190718030039.676518610@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org [ Upstream commit 13ec7f10b87f5fc04c4ccbd491c94c7980236a74 ] mwifiex_update_bss_desc_with_ie() calls memcpy() unconditionally in a couple places without checking the destination size. Since the source is given from user-space, this may trigger a heap buffer overflow. Fix it by putting the length check before performing memcpy(). This fix addresses CVE-2019-3846. Reported-by: huangwen Signed-off-by: Takashi Iwai Signed-off-by: Kalle Valo Signed-off-by: Sasha Levin --- drivers/net/wireless/mwifiex/scan.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/net/wireless/mwifiex/scan.c b/drivers/net/wireless/mwifiex/scan.c index fb98f42cb5e7..6f789899c888 100644 --- a/drivers/net/wireless/mwifiex/scan.c +++ b/drivers/net/wireless/mwifiex/scan.c @@ -1219,6 +1219,8 @@ int mwifiex_update_bss_desc_with_ie(struct mwifiex_adapter *adapter, } switch (element_id) { case WLAN_EID_SSID: + if (element_len > IEEE80211_MAX_SSID_LEN) + return -EINVAL; bss_entry->ssid.ssid_len = element_len; memcpy(bss_entry->ssid.ssid, (current_ptr + 2), element_len); @@ -1228,6 +1230,8 @@ int mwifiex_update_bss_desc_with_ie(struct mwifiex_adapter *adapter, break; case WLAN_EID_SUPP_RATES: + if (element_len > MWIFIEX_SUPPORTED_RATES) + return -EINVAL; memcpy(bss_entry->data_rates, current_ptr + 2, element_len); memcpy(bss_entry->supported_rates, current_ptr + 2, -- 2.20.1