shinys000114/linux
1
0
Fork 0
mirror of https://github.com/hardkernel/linux.git synced 2026-06-07 11:26:02 +09:00
Code Issues Packages Projects Releases Wiki Activity

net: cdc_ether: fix divide by 0 on bad descriptors

Browse Source 
commit 2cb80187ba 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 <bjorn@mork.no>
Acked-by: Oliver Neukum <oneukum@suse.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Bjørn Mork
2017-11-06 15:37:22 +01:00
committed by Greg Kroah-Hartman
parent 46bdabbca0
commit caeeef8438
1 changed files with 1 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/net/usb/cdc_ether.c
View File

@@ -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.