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 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 750CDC433EF for ; Mon, 25 Oct 2021 19:18:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5B794610CF for ; Mon, 25 Oct 2021 19:18:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234608AbhJYTUe (ORCPT ); Mon, 25 Oct 2021 15:20:34 -0400 Received: from mail.kernel.org ([198.145.29.99]:37694 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234697AbhJYTTl (ORCPT ); Mon, 25 Oct 2021 15:19:41 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id AF5ED610A5; Mon, 25 Oct 2021 19:17:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1635189438; bh=5+O5luxEq+ZJHTsBpfKr8ocub3IP1PsSW3FLEVO+9B8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=mlnQXSVCMY8x0eaD8T5MKeAMBgnU8oc3k4dTbO/wQoEAIWJOqMwtMWTgPI0ZK2Gvp Veip8jBvcFx9XPIx/2iuwPsUWDZAIPAD/g9uwy+R6nRzBN77eq1N+QD8eMhUJK2Ih8 qwF57Wj/ISZyLRIh2kh/eLeiPXoICN27hneQlHv4= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Oliver Neukum , syzbot+76bb1d34ffa0adc03baa@syzkaller.appspotmail.com, Johan Hovold , Jakub Kicinski Subject: [PATCH 4.4 41/44] usbnet: sanity check for maxpacket Date: Mon, 25 Oct 2021 21:14:22 +0200 Message-Id: <20211025190936.928156150@linuxfoundation.org> X-Mailer: git-send-email 2.33.1 In-Reply-To: <20211025190928.054676643@linuxfoundation.org> References: <20211025190928.054676643@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: stable@vger.kernel.org From: Oliver Neukum commit 397430b50a363d8b7bdda00522123f82df6adc5e upstream. maxpacket of 0 makes no sense and oopses as we need to divide by it. Give up. V2: fixed typo in log and stylistic issues Signed-off-by: Oliver Neukum Reported-by: syzbot+76bb1d34ffa0adc03baa@syzkaller.appspotmail.com Reviewed-by: Johan Hovold Link: https://lore.kernel.org/r/20211021122944.21816-1-oneukum@suse.com Signed-off-by: Jakub Kicinski Signed-off-by: Greg Kroah-Hartman --- drivers/net/usb/usbnet.c | 4 ++++ 1 file changed, 4 insertions(+) --- a/drivers/net/usb/usbnet.c +++ b/drivers/net/usb/usbnet.c @@ -1730,6 +1730,10 @@ usbnet_probe (struct usb_interface *udev if (!dev->rx_urb_size) dev->rx_urb_size = dev->hard_mtu; dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1); + if (dev->maxpacket == 0) { + /* that is a broken device */ + goto out4; + } /* let userspace know we have a random address */ if (ether_addr_equal(net->dev_addr, node_id))