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=-6.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 1D85CC43381 for ; Fri, 8 Mar 2019 12:57:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E1E832085A for ; Fri, 8 Mar 2019 12:57:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1552049858; bh=4zExt0FtGFVFpvoLOrks5FrmI9clKEbz0lm5hmL2sz0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=QqgRvg5bphTswVqlEuLbQw5YiCmT9fLTC+pfOyjoTyOgYWm/0wL3Mx876HFeoC7Yy 7u/BCDZ7wlsiIYLxUG5ufdi1zmaa0/yh/LDfvNU0fKUfa1y8KPI8f1VIXC+To9Rw7P nRFkeZhOvY7cwTjuCNx+ZVmPlsGtQVVHXfgpRF84= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727882AbfCHM5f (ORCPT ); Fri, 8 Mar 2019 07:57:35 -0500 Received: from mail.kernel.org ([198.145.29.99]:33920 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727862AbfCHM5c (ORCPT ); Fri, 8 Mar 2019 07:57:32 -0500 Received: from localhost (5356596B.cm-6-7b.dynamic.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 D9AAE20449; Fri, 8 Mar 2019 12:57:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1552049851; bh=4zExt0FtGFVFpvoLOrks5FrmI9clKEbz0lm5hmL2sz0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=DXpiiZXpkO2rjgmcGMKD6/wV5yFlltHmtAyCm7ZRRBfWYxaiGuXhYG1Tk4Ry4Os/U EFjeUdqW/F88N64aar7JQlpiVTUO0tD/S/LJCIAVioCfPxPuYoKiaf0teQTLn+AyXM 7YK2FovZCJ7AN2NbWy1t+ASaGQtxW5uOeUu9/+SA= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Michael Chan , "David S. Miller" Subject: [PATCH 4.20 30/76] bnxt_en: Drop oversize TX packets to prevent errors. Date: Fri, 8 Mar 2019 13:49:42 +0100 Message-Id: <20190308124915.881118015@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190308124914.789210760@linuxfoundation.org> References: <20190308124914.789210760@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore 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 4.20-stable review patch. If anyone has any objections, please let me know. ------------------ From: Michael Chan [ Upstream commit 2b3c6885386020b1b9d92d45e8349637e27d1f66 ] There have been reports of oversize UDP packets being sent to the driver to be transmitted, causing error conditions. The issue is likely caused by the dst of the SKB switching between 'lo' with 64K MTU and the hardware device with a smaller MTU. Patches are being proposed by Mahesh Bandewar to fix the issue. In the meantime, add a quick length check in the driver to prevent the error. The driver uses the TX packet size as index to look up an array to setup the TX BD. The array is large enough to support all MTU sizes supported by the driver. The oversize TX packet causes the driver to index beyond the array and put garbage values into the TX BD. Add a simple check to prevent this. Signed-off-by: Michael Chan Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- drivers/net/ethernet/broadcom/bnxt/bnxt.c | 6 ++++++ 1 file changed, 6 insertions(+) --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c @@ -497,6 +497,12 @@ normal_tx: } length >>= 9; + if (unlikely(length >= ARRAY_SIZE(bnxt_lhint_arr))) { + dev_warn_ratelimited(&pdev->dev, "Dropped oversize %d bytes TX packet.\n", + skb->len); + i = 0; + goto tx_dma_error; + } flags |= bnxt_lhint_arr[length]; txbd->tx_bd_len_flags_type = cpu_to_le32(flags);