diff options
| author | Bjørn Mork <bjorn@mork.no> | 2017-11-06 15:37:22 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-11-24 08:33:40 +0100 |
| commit | f376621861e3d8a713d6931f4363c4137912330b (patch) | |
| tree | 806b9c145e42daaf2a7e4ca664a19298712c4e66 /drivers | |
| parent | 6f239c0655cfe90c3e048bccb2e74ab1780cabba (diff) | |
net: cdc_ether: fix divide by 0 on bad descriptors
[ 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@mork.no>
Acked-by: Oliver Neukum <oneukum@suse.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/usb/cdc_ether.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/net/usb/cdc_ether.c b/drivers/net/usb/cdc_ether.c index b82be816256c..1fca0024f294 100644 --- 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. |