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,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 2D82EC33C9E for ; Sat, 11 Jan 2020 10:10:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EBEBC20673 for ; Sat, 11 Jan 2020 10:10:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1578737456; bh=0H7jxEWn0kJ94GucQWB7iemHQgpagReOFqt9e26JIAU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=ioXqYp+AEbkO/Gr3RqsyBuZiaw0k9WQB5Ls125Tcm2dz4qt8jW3usPPj/jjJHW9C/ 2Cptq22rLU994G+EHDg5YGl3sbTNhFcPheP7IVXrqIb1TdaBjfUdDMRNCicYV1szHn +rXQ7JoV68iSc9E9jreLwQ+HO43DB2lajSKpmBXQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729936AbgAKKKz (ORCPT ); Sat, 11 Jan 2020 05:10:55 -0500 Received: from mail.kernel.org ([198.145.29.99]:47748 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729229AbgAKKKx (ORCPT ); Sat, 11 Jan 2020 05:10:53 -0500 Received: from localhost (unknown [62.119.166.9]) (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 E28232077C; Sat, 11 Jan 2020 10:10:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1578737452; bh=0H7jxEWn0kJ94GucQWB7iemHQgpagReOFqt9e26JIAU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=1vaCsI7i3MnCfaQbxAbfMnvC+3N+kJU9aZYtrezr/UgJFL5TTJjOfjNB42LITm0jv aeHIiyEj2f54NfqX4sBsc3lD4gbW1S0zSW2s5UZ7HILkYAPceJt29KGQ94ZI6iSuFZ wip8FLYWYc/VL+J7j7aYbwvaF3F5aABtnF+xz9pg= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jose Abreu , "David S. Miller" , Sasha Levin Subject: [PATCH 4.14 32/62] net: stmmac: Do not accept invalid MTU values Date: Sat, 11 Jan 2020 10:50:14 +0100 Message-Id: <20200111094845.869349916@linuxfoundation.org> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200111094837.425430968@linuxfoundation.org> References: <20200111094837.425430968@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: Jose Abreu [ Upstream commit eaf4fac478077d4ed57cbca2c044c4b58a96bd98 ] The maximum MTU value is determined by the maximum size of TX FIFO so that a full packet can fit in the FIFO. Add a check for this in the MTU change callback. Also check if provided and rounded MTU does not passes the maximum limit of 16K. Changes from v2: - Align MTU before checking if its valid Fixes: 7ac6653a085b ("stmmac: Move the STMicroelectronics driver") Signed-off-by: Jose Abreu Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c index e6d16c48ffef..4ef923f1094a 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c @@ -3597,12 +3597,24 @@ static void stmmac_set_rx_mode(struct net_device *dev) static int stmmac_change_mtu(struct net_device *dev, int new_mtu) { struct stmmac_priv *priv = netdev_priv(dev); + int txfifosz = priv->plat->tx_fifo_size; + + if (txfifosz == 0) + txfifosz = priv->dma_cap.tx_fifo_size; + + txfifosz /= priv->plat->tx_queues_to_use; if (netif_running(dev)) { netdev_err(priv->dev, "must be stopped to change its MTU\n"); return -EBUSY; } + new_mtu = STMMAC_ALIGN(new_mtu); + + /* If condition true, FIFO is too small or MTU too large */ + if ((txfifosz < new_mtu) || (new_mtu > BUF_SIZE_16KiB)) + return -EINVAL; + dev->mtu = new_mtu; netdev_update_features(dev); -- 2.20.1