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=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 B90E9C742BA for ; Fri, 12 Jul 2019 12:20:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 81533208E4 for ; Fri, 12 Jul 2019 12:20:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1562934003; bh=aTgW7UQYMBIXvwxYkq0UvLaH0b2HY8X9ODd0ju4GUFg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=DUV5jXkHauj2iLlct/61CcWVZw+FYki0YgPeto7HAnHvmAQ458heFWDKv0SkDxf10 b5J24tM3JeFb3fZ0wEAgfZhKJdd43N6RYvtiGZNif6PpJDhUJv9/e/CtqGlDQgG8Fs YISqiL8QmbjDN3rsveq+4j1jaupO4fZjUBDpU+vY= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727193AbfGLMUC (ORCPT ); Fri, 12 Jul 2019 08:20:02 -0400 Received: from mail.kernel.org ([198.145.29.99]:52958 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727145AbfGLMUA (ORCPT ); Fri, 12 Jul 2019 08:20:00 -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 DF88E208E4; Fri, 12 Jul 2019 12:19:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1562933999; bh=aTgW7UQYMBIXvwxYkq0UvLaH0b2HY8X9ODd0ju4GUFg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dtsHoYpYMVK/lfjzhaIQE8kCoCThHSxj0EIM2tIrRnAokLoU+zRH7uZU0wsQUC3VW GBmpDNBIPUpnaRrFXF08k7liDWU1XcrBwYUfZRUCYQ0X6yDwRuJ9M/hDC4FSZyIBUy 4JGr66LY8nO5GS1ryYww8hR6ikhi8QSNIMW2FG/4= 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 4.19 14/91] mwifiex: Fix possible buffer overflows at parsing bss descriptor Date: Fri, 12 Jul 2019 14:18:17 +0200 Message-Id: <20190712121622.166165144@linuxfoundation.org> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20190712121621.422224300@linuxfoundation.org> References: <20190712121621.422224300@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 [ 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/marvell/mwifiex/scan.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/net/wireless/marvell/mwifiex/scan.c b/drivers/net/wireless/marvell/mwifiex/scan.c index 8e483b0bc3b1..ddf985fb93ab 100644 --- a/drivers/net/wireless/marvell/mwifiex/scan.c +++ b/drivers/net/wireless/marvell/mwifiex/scan.c @@ -1247,6 +1247,8 @@ 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); @@ -1256,6 +1258,8 @@ 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