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 D4BABC352AA for ; Tue, 1 Oct 2019 16:47:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9CA1E20659 for ; Tue, 1 Oct 2019 16:47:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1569948451; bh=TlmuF76YCkfP0X9fLr4tKl4PM2Et9XRorTWtuWYtaxE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Ky5mMmD/oA+YAtH6avt15dZNj5R//MH5wrppYeihObifr7l/sn0RaQOZ5/UjaCPyZ ZCjyyPsdnuJZeNDKVmyekB9FJMB3FZGxBnOXl1Xggl3q53vcKMPtYfdIftb906DA+m X8uGT2N5PCPOktUWvr0/1NncauFeAxBbccYSa5ro= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388599AbfJAQrZ (ORCPT ); Tue, 1 Oct 2019 12:47:25 -0400 Received: from mail.kernel.org ([198.145.29.99]:58024 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390304AbfJAQpc (ORCPT ); Tue, 1 Oct 2019 12:45:32 -0400 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 8C2CE21A4C; Tue, 1 Oct 2019 16:45:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1569948331; bh=TlmuF76YCkfP0X9fLr4tKl4PM2Et9XRorTWtuWYtaxE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=x/fVMVTKIxWOc79qafevF9MDMfWOwEvRiAU7qaWUobU5Eu8TdCGkTEVT8e0VGWzWy Zxs71EtyCC3miUsp+WqpA95bJZs1D+VgWYwy7RcNlQ4lrvD71/OP1YgvX+4TbXiGYh QmkQASfkt04yZ0K4Xde5CRe7hE9hJecsa9ARiqoo= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Oliver Neukum , "David S . Miller" , Sasha Levin , netdev@vger.kernel.org, linux-usb@vger.kernel.org Subject: [PATCH AUTOSEL 4.9 18/19] usbnet: sanity checking of packet sizes and device mtu Date: Tue, 1 Oct 2019 12:45:04 -0400 Message-Id: <20191001164505.16708-18-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191001164505.16708-1-sashal@kernel.org> References: <20191001164505.16708-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Oliver Neukum [ Upstream commit 280ceaed79f18db930c0cc8bb21f6493490bf29c ] After a reset packet sizes and device mtu can change and need to be reevaluated to calculate queue sizes. Malicious devices can set this to zero and we divide by it. Introduce sanity checking. Reported-and-tested-by: syzbot+6102c120be558c885f04@syzkaller.appspotmail.com Signed-off-by: Oliver Neukum Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/usb/usbnet.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c index 6d0efeb28f5cb..0b5fd1499ac06 100644 --- a/drivers/net/usb/usbnet.c +++ b/drivers/net/usb/usbnet.c @@ -354,6 +354,8 @@ void usbnet_update_max_qlen(struct usbnet *dev) { enum usb_device_speed speed = dev->udev->speed; + if (!dev->rx_urb_size || !dev->hard_mtu) + goto insanity; switch (speed) { case USB_SPEED_HIGH: dev->rx_qlen = MAX_QUEUE_MEMORY / dev->rx_urb_size; @@ -370,6 +372,7 @@ void usbnet_update_max_qlen(struct usbnet *dev) dev->tx_qlen = 5 * MAX_QUEUE_MEMORY / dev->hard_mtu; break; default: +insanity: dev->rx_qlen = dev->tx_qlen = 4; } } -- 2.20.1