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 3E708C3B19F for ; Fri, 14 Feb 2020 16:30:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0EB2A246FC for ; Fri, 14 Feb 2020 16:30:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581697841; bh=du9oXxZbxUbew44pUv5fioKxk69e07rtJO050qyje3k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=SiSkxR++xGH4Z1pHI8XK1PUDysvY8jjHYXnxKEDtHtNgJZnfLTVnqCFYoU0F5FPvX HncRmgfad7rLCp3YDd8R9duHs1MfWThou3kZVKv01FJ66FNcwW2k076jPocIY9CjJL wVPPfCWNXdeOpKJSzopgAoOJ3B9KN+Iznp9wpPFE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2405449AbgBNQ0R (ORCPT ); Fri, 14 Feb 2020 11:26:17 -0500 Received: from mail.kernel.org ([198.145.29.99]:36756 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2406363AbgBNQ0Q (ORCPT ); Fri, 14 Feb 2020 11:26:16 -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 D8C0C246FB; Fri, 14 Feb 2020 16:26:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581697575; bh=du9oXxZbxUbew44pUv5fioKxk69e07rtJO050qyje3k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=1mvelescX/rqV3oLvWy0zinLCQkwfqCRLz9oS0p0w6tMrKuWXUHvoFfudS1VuYjLY Vk/pLNsz9BigBSr7PknUZvqrZoZv8/okt2dDD4i1EsqL5GVk1KGv2G/XZgImUkQSz5 CHaWBvqPSDg4j0wVQLFs9ObvRmoy1HCTQ6t3Gk0U= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Qing Xu , Kalle Valo , Sasha Levin , linux-wireless@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH AUTOSEL 4.4 089/100] mwifiex: Fix possible buffer overflows in mwifiex_cmd_append_vsie_tlv() Date: Fri, 14 Feb 2020 11:24:13 -0500 Message-Id: <20200214162425.21071-89-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200214162425.21071-1-sashal@kernel.org> References: <20200214162425.21071-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Qing Xu [ Upstream commit b70261a288ea4d2f4ac7cd04be08a9f0f2de4f4d ] mwifiex_cmd_append_vsie_tlv() 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: Qing Xu Signed-off-by: Kalle Valo Signed-off-by: Sasha Levin --- drivers/net/wireless/mwifiex/scan.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/net/wireless/mwifiex/scan.c b/drivers/net/wireless/mwifiex/scan.c index 39b78dc1bd92b..e7c8972431d34 100644 --- a/drivers/net/wireless/mwifiex/scan.c +++ b/drivers/net/wireless/mwifiex/scan.c @@ -2568,6 +2568,13 @@ mwifiex_cmd_append_vsie_tlv(struct mwifiex_private *priv, vs_param_set->header.len = cpu_to_le16((((u16) priv->vs_ie[id].ie[1]) & 0x00FF) + 2); + if (le16_to_cpu(vs_param_set->header.len) > + MWIFIEX_MAX_VSIE_LEN) { + mwifiex_dbg(priv->adapter, ERROR, + "Invalid param length!\n"); + break; + } + memcpy(vs_param_set->ie, priv->vs_ie[id].ie, le16_to_cpu(vs_param_set->header.len)); *buffer += le16_to_cpu(vs_param_set->header.len) + -- 2.20.1