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=-18.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,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 D883BC43332 for ; Mon, 1 Mar 2021 18:49:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B430864DDC for ; Mon, 1 Mar 2021 18:49:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240615AbhCASsb (ORCPT ); Mon, 1 Mar 2021 13:48:31 -0500 Received: from mail.kernel.org ([198.145.29.99]:46814 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235132AbhCAQnK (ORCPT ); Mon, 1 Mar 2021 11:43:10 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id E1B9064F45; Mon, 1 Mar 2021 16:29:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1614616190; bh=n51F1MoN36qtB0JkCbdX+vfS5gpEkfHxqyNDS/heVHE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=1mh0kIVTvUV4XVcOmruWXqM7HJJSKNG/DNq9APcPyujSAMNk7SmE6gur/PuYS0O5W BQwrui5RB1GLxRn/2dTkjyhbQ2Ref6LlNOcqFH/2cfcLUg1LUHH6yjLr5PERSe23EA MeEk9jXz3vRuucDlD27Z3GpTwLDAFkR+zOVwcWYE= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Colin Ian King , Johannes Berg , Sasha Levin Subject: [PATCH 4.14 035/176] mac80211: fix potential overflow when multiplying to u32 integers Date: Mon, 1 Mar 2021 17:11:48 +0100 Message-Id: <20210301161022.721373161@linuxfoundation.org> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210301161020.931630716@linuxfoundation.org> References: <20210301161020.931630716@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Colin Ian King [ Upstream commit 6194f7e6473be78acdc5d03edd116944bdbb2c4e ] The multiplication of the u32 variables tx_time and estimated_retx is performed using a 32 bit multiplication and the result is stored in a u64 result. This has a potential u32 overflow issue, so avoid this by casting tx_time to a u64 to force a 64 bit multiply. Addresses-Coverity: ("Unintentional integer overflow") Fixes: 050ac52cbe1f ("mac80211: code for on-demand Hybrid Wireless Mesh Protocol") Signed-off-by: Colin Ian King Link: https://lore.kernel.org/r/20210205175352.208841-1-colin.king@canonical.com Signed-off-by: Johannes Berg Signed-off-by: Sasha Levin --- net/mac80211/mesh_hwmp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/mac80211/mesh_hwmp.c b/net/mac80211/mesh_hwmp.c index fe65701fe95cc..f57232bcd4057 100644 --- a/net/mac80211/mesh_hwmp.c +++ b/net/mac80211/mesh_hwmp.c @@ -355,7 +355,7 @@ static u32 airtime_link_metric_get(struct ieee80211_local *local, */ tx_time = (device_constant + 10 * test_frame_len / rate); estimated_retx = ((1 << (2 * ARITH_SHIFT)) / (s_unit - err)); - result = (tx_time * estimated_retx) >> (2 * ARITH_SHIFT); + result = ((u64)tx_time * estimated_retx) >> (2 * ARITH_SHIFT); return (u32)result; } -- 2.27.0