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 4.9-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-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Tue Nov 21 13:08:13 CET 2017
From: Bjørn Mork <bjorn@xxxxxxx>
Date: Mon, 6 Nov 2017 15:37:22 +0100
Subject: net: cdc_ether: fix divide by 0 on bad descriptors
From: Bjørn Mork <bjorn@xxxxxxx>
[ Upstream commit 2cb80187ba065d7decad7c6614e35e07aec8a974 ]
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 <bjorn@xxxxxxx>
Acked-by: Oliver Neukum <oneukum@xxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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@xxxxxxx are
queue-4.9/net-cdc_ether-fix-divide-by-0-on-bad-descriptors.patch
queue-4.9/qmi_wwan-add-missing-skb_reset_mac_header-call.patch
queue-4.9/net-qmi_wwan-fix-divide-by-0-on-bad-descriptors.patch