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=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,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 88C5BC4361A for ; Wed, 23 Dec 2020 02:27:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6526422202 for ; Wed, 23 Dec 2020 02:27:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729905AbgLWC1K (ORCPT ); Tue, 22 Dec 2020 21:27:10 -0500 Received: from mail.kernel.org ([198.145.29.99]:57178 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730913AbgLWC0g (ORCPT ); Tue, 22 Dec 2020 21:26:36 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 205C32332A; Wed, 23 Dec 2020 02:25:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1608690355; bh=au8gNUmjCcxfgczqLam57knzjW+A5ZRyBxc0fF4OJWE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cx4aDXdmTfqnQuiJ0noj6Om1uieTCiiT1Oc9n9eBZGxP41paqJ4YAw2BzqaOCqQkz hYHM3BzdYFoRh9ydTMuXWWJCp/ocPJoJmR2oKrCdAs2aJjv9Jn7/EIVDzbZELLv/nU R7vO6s0ip0x5SHhYemxfAosHaMmKJM3cgHdJf96W6Fw1G8Pxi0v891fY5h6+5l3oUu dxTa5b0iyWK14XGma0RY1gDa5cqlOnWQf+ZrsxX4AkTnlHo4DRqmjEBTL3NT6HYq1W w19xlpaaVDGZsJjQLfQvUY3soubTdL9eLJVFd3XzEcbQ9awb7VR+cedjRKunN+aUQI xxeMpaIOVBi6g== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Zhang Xiaohui , Kalle Valo , Sasha Levin , linux-wireless@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH AUTOSEL 4.4 31/38] mwifiex: Fix possible buffer overflows in mwifiex_cmd_802_11_ad_hoc_start Date: Tue, 22 Dec 2020 21:25:09 -0500 Message-Id: <20201223022516.2794471-31-sashal@kernel.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20201223022516.2794471-1-sashal@kernel.org> References: <20201223022516.2794471-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Zhang Xiaohui [ Upstream commit 5c455c5ab332773464d02ba17015acdca198f03d ] mwifiex_cmd_802_11_ad_hoc_start() calls memcpy() without checking the destination size may trigger a buffer overflower, which a local user could use to cause denial of service or the execution of arbitrary code. Fix it by putting the length check before calling memcpy(). Signed-off-by: Zhang Xiaohui Signed-off-by: Kalle Valo Link: https://lore.kernel.org/r/20201206084801.26479-1-ruc_zhangxiaohui@163.com Signed-off-by: Sasha Levin --- drivers/net/wireless/mwifiex/join.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/net/wireless/mwifiex/join.c b/drivers/net/wireless/mwifiex/join.c index 6378dfd3b4e86..83b7cd5bdf930 100644 --- a/drivers/net/wireless/mwifiex/join.c +++ b/drivers/net/wireless/mwifiex/join.c @@ -856,6 +856,8 @@ mwifiex_cmd_802_11_ad_hoc_start(struct mwifiex_private *priv, memset(adhoc_start->ssid, 0, IEEE80211_MAX_SSID_LEN); + if (req_ssid->ssid_len > IEEE80211_MAX_SSID_LEN) + req_ssid->ssid_len = IEEE80211_MAX_SSID_LEN; memcpy(adhoc_start->ssid, req_ssid->ssid, req_ssid->ssid_len); mwifiex_dbg(adapter, INFO, "info: ADHOC_S_CMD: SSID = %s\n", -- 2.27.0