From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:41114 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751050AbdKSKTz (ORCPT ); Sun, 19 Nov 2017 05:19:55 -0500 Subject: Patch "net: cdc_ether: fix divide by 0 on bad descriptors" has been added to the 4.4-stable tree To: bjorn@mork.no, ben.hutchings@codethink.co.uk, davem@davemloft.net, gregkh@linuxfoundation.org, oneukum@suse.com Cc: , From: Date: Sun, 19 Nov 2017 11:19:45 +0100 Message-ID: <15110867857086@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled net: cdc_ether: fix divide by 0 on bad descriptors to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: net-cdc_ether-fix-divide-by-0-on-bad-descriptors.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From foo@baz Sun Nov 19 11:12:05 CET 2017 From: Bj�rn Mork Date: Mon, 6 Nov 2017 15:37:22 +0100 Subject: net: cdc_ether: fix divide by 0 on bad descriptors From: Bj�rn Mork commit 2cb80187ba065d7decad7c6614e35e07aec8a974 upstream. Setting dev->hard_mtu to 0 will cause a divide error in usbnet_probe. Protect against devices with bogus CDC Ethernet functional descriptors by ignoring a zero wMaxSegmentSize. Signed-off-by: Bjørn Mork Acked-by: Oliver Neukum Signed-off-by: David S. Miller Signed-off-by: Ben Hutchings Signed-off-by: Greg Kroah-Hartman --- drivers/net/usb/cdc_ether.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/net/usb/cdc_ether.c +++ b/drivers/net/usb/cdc_ether.c @@ -221,7 +221,7 @@ skip: goto bad_desc; } - if (header.usb_cdc_ether_desc) { + if (header.usb_cdc_ether_desc && info->ether->wMaxSegmentSize) { dev->hard_mtu = le16_to_cpu(info->ether->wMaxSegmentSize); /* because of Zaurus, we may be ignoring the host * side link address we were given. Patches currently in stable-queue which might be from bjorn@mork.no are queue-4.4/net-cdc_ether-fix-divide-by-0-on-bad-descriptors.patch queue-4.4/net-qmi_wwan-fix-divide-by-0-on-bad-descriptors.patch