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 54C69C433F5 for ; Mon, 1 Nov 2021 09:23:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3D8CD61242 for ; Mon, 1 Nov 2021 09:23:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232308AbhKAJ0L (ORCPT ); Mon, 1 Nov 2021 05:26:11 -0400 Received: from mail.kernel.org ([198.145.29.99]:58554 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232491AbhKAJXg (ORCPT ); Mon, 1 Nov 2021 05:23:36 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id AA27A610A8; Mon, 1 Nov 2021 09:20:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1635758448; bh=m4vu12vnujXJGiY9YknzWfRdnNvdxK4B2TtJrvSzznY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=0pEotvlHFN6dZ0xUmRgKjFK3R2we9VcWy5sMxs58ggOKmAB+7vd5OVasDhNyb0LU3 X9BpOrDfBNgl/n8hbpMuH5LW+LQBvcuNDsGxfPBnTB+Lsq4T5YH5gAxQ5Oska1qBWw nXeSeib1NBJYUnI74+l4sy5ojoCkdyAsG9U3/XB0= 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 4.14 06/25] usbnet: sanity check for maxpacket Date: Mon, 1 Nov 2021 10:17:18 +0100 Message-Id: <20211101082448.493704511@linuxfoundation.org> X-Mailer: git-send-email 2.33.1 In-Reply-To: <20211101082447.070493993@linuxfoundation.org> References: <20211101082447.070493993@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: linux-kernel@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 @@ -1788,6 +1788,10 @@ 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))