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 0B0E2C433F5 for ; Mon, 25 Oct 2021 17:03:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EA1A960F22 for ; Mon, 25 Oct 2021 17:03:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234985AbhJYRFe (ORCPT ); Mon, 25 Oct 2021 13:05:34 -0400 Received: from mail.kernel.org ([198.145.29.99]:55192 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234557AbhJYRDd (ORCPT ); Mon, 25 Oct 2021 13:03:33 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id B27A961076; Mon, 25 Oct 2021 17:00:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1635181260; bh=WSqP0+ETVuEx8KUA8+myAu03Gu78CANtYBzMyXbplCU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ArhiOyhk6qGyCVkY9C0M46/5jTRPKY7SAUaRn/yMQtIfjbveIYRscVXr3LEfg8deJ YNUCBLQiepuEIyw99Hh/dmyqDu+zAOAGYJfAvV3MKbkCGRReUP3m2XteymUnNdxbwh J8TeZMziY62sDghjapAt32TmgPJ/9N9nYWfWo2ulbjB+SJQL3L+/dRydv9/3FqrRKH 7X40Gqhh9NXimxcO84VEvyygtIX8545qefeVXurK/r+mij3dyq2xxDl4aMYnUKHQOv L/YlN31FTPxA6+ZYDfLcu6ad/wUoTurooQ540Ffv45gmfoYf0GZRyOKUK9UdLHPpU+ rPaxUMNOlZ20A== 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 5.4 8/9] usbnet: sanity check for maxpacket Date: Mon, 25 Oct 2021 13:00:47 -0400 Message-Id: <20211025170048.1394542-8-sashal@kernel.org> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20211025170048.1394542-1-sashal@kernel.org> References: <20211025170048.1394542-1-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 dde05e2fdc3e..be8b4321ffaa 100644 --- a/drivers/net/usb/usbnet.c +++ b/drivers/net/usb/usbnet.c @@ -1773,6 +1773,10 @@ 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