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 3C27CC433F5 for ; Mon, 25 Oct 2021 17:04:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2A68B60F22 for ; Mon, 25 Oct 2021 17:04:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234644AbhJYRGx (ORCPT ); Mon, 25 Oct 2021 13:06:53 -0400 Received: from mail.kernel.org ([198.145.29.99]:55454 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234855AbhJYREm (ORCPT ); Mon, 25 Oct 2021 13:04:42 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 221716108C; Mon, 25 Oct 2021 17:01:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1635181298; bh=faspEgg5FVt2f9ngascZR3HcPRDTT4d+RY/lzZDFwbA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=hARd2Q7vSZqVF9sDPP7mT8rLXHNwYYjFZz99vMW3bI8vBDsfFuooEs+xzcIUPTRuX 9WYqxK5/oLgUJRB4dtlabC1ZnU3v8MKZzil4oOUDlkfNE55duGXqVw5fNHCN0rDzAw 3P04qgZFmNcy2cHFAtjWRyw3yG6EQPGpmlPwq6YnMpUstejU9WwrvV2jXD44XeQuAY kS/Z0V0SnavZkWn8Ue5exv3LuifbEwzH4XFg0Z3M6me8cwAaTT9Ggs+UBZ5xTpFuGs r/OhgET59/sSsxucA5xbOXDPwFDrRCoVd8WtWs6MHg+z6cB3QPoILgG8YxTo8VZOo1 Ly896ANzMQcmQ== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Oliver Neukum , syzbot+76bb1d34ffa0adc03baa@syzkaller.appspotmail.com, Johan Hovold , Jakub Kicinski , Sasha Levin , davem@davemloft.net, netdev@vger.kernel.org, linux-usb@vger.kernel.org Subject: [PATCH AUTOSEL 4.9 3/4] usbnet: sanity check for maxpacket Date: Mon, 25 Oct 2021 13:01:31 -0400 Message-Id: <20211025170132.1394887-3-sashal@kernel.org> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20211025170132.1394887-1-sashal@kernel.org> References: <20211025170132.1394887-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Oliver Neukum [ Upstream commit 397430b50a363d8b7bdda00522123f82df6adc5e ] 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: Sasha Levin --- drivers/net/usb/usbnet.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c index 0b5fd1499ac0..965e1a7b179f 100644 --- a/drivers/net/usb/usbnet.c +++ b/drivers/net/usb/usbnet.c @@ -1740,6 +1740,10 @@ usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod) 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)) -- 2.33.0