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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,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 0627AC10F14 for ; Sun, 6 Oct 2019 17:52:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C794C20673 for ; Sun, 6 Oct 2019 17:52:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1570384324; bh=IAvCUtQoEkkm/ms8EqboKBC0qzh6TVyhRsg0uyoDaFU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=D8rVahPaTEFM6l7Qq1rzWp/zTSlynAwQ+0eaA6j4V2KshTPtxYrSYIxJLO6yHL/D2 JtDF0xEVERPevpmF2CTLUs3oE34i/MOZnIA8zfVsyRPnUDdRrEx8anLInd//D3sOu9 PE0nLQ60su7cHmGgcrSv3uUhsgZrghOYYA2NlMgY= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727575AbfJFRwE (ORCPT ); Sun, 6 Oct 2019 13:52:04 -0400 Received: from mail.kernel.org ([198.145.29.99]:49028 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728034AbfJFRu5 (ORCPT ); Sun, 6 Oct 2019 13:50:57 -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 A2CDA222D0; Sun, 6 Oct 2019 17:45:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1570383952; bh=IAvCUtQoEkkm/ms8EqboKBC0qzh6TVyhRsg0uyoDaFU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=MXuwVu7rDla4UV9TQ5eNKxcnidvG+3DimOQ0qdBFzsQMKLX78wWNNRqUsGmDvBwym jiUbjLvsZs/cET0VC6x901gKCGjb65s+0/jF/ioZtFfS/Ug9yFZYQ/NhTS3+lvqFq6 elzzTpkPbMHX7Q44Mkk6ID1iPOp48WKXyCay05/Q= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Vladimir Oltean , Vinicius Costa Gomes , "David S. Miller" Subject: [PATCH 5.3 156/166] net: sched: cbs: Avoid division by zero when calculating the port rate Date: Sun, 6 Oct 2019 19:22:02 +0200 Message-Id: <20191006171226.022911349@linuxfoundation.org> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191006171212.850660298@linuxfoundation.org> References: <20191006171212.850660298@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 From: Vladimir Oltean [ Upstream commit 83c8c3cf45163f0c823db37be6ab04dfcf8ac751 ] As explained in the "net: sched: taprio: Avoid division by zero on invalid link speed" commit, it is legal for the ethtool API to return zero as a link speed. So guard against it to ensure we don't perform a division by zero in kernel. Fixes: e0a7683d30e9 ("net/sched: cbs: fix port_rate miscalculation") Signed-off-by: Vladimir Oltean Acked-by: Vinicius Costa Gomes Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/sched/sch_cbs.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/net/sched/sch_cbs.c +++ b/net/sched/sch_cbs.c @@ -306,7 +306,7 @@ static void cbs_set_port_rate(struct net if (err < 0) goto skip; - if (ecmd.base.speed != SPEED_UNKNOWN) + if (ecmd.base.speed && ecmd.base.speed != SPEED_UNKNOWN) speed = ecmd.base.speed; skip: