diff options
| author | Bjørn Mork <bjorn@mork.no> | 2017-11-06 17:37:22 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-11-24 10:35:56 +0300 |
| commit | f99427bc5d83e5c8546560c006effa91592cfcc4 (patch) | |
| tree | 31c826316f5223e58520c56b3147f5047f44f35f | |
| parent | efe3058c6214b29016a93d59bde0955d3bfc3291 (diff) | |
| download | linux-f99427bc5d83e5c8546560c006effa91592cfcc4.tar.xz | |
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>
| -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 8ab281b478f2..4f88f64cccb4 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. |