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| author | Bjørn Mork <bjorn@mork.no> | 2017-11-06 15:37:22 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-11-08 13:42:01 +0900 |
| commit | 2cb80187ba065d7decad7c6614e35e07aec8a974 (patch) | |
| tree | 5eaea6c250d176f2b2f04cf13a6708f6b495c7d4 /drivers/net/usb/cdc_ether.c | |
| parent | b5f862180d7011d9575d0499fa37f0f25b423b12 (diff) | |
| download | linux-2cb80187ba065d7decad7c6614e35e07aec8a974.tar.gz linux-2cb80187ba065d7decad7c6614e35e07aec8a974.tar.bz2 linux-2cb80187ba065d7decad7c6614e35e07aec8a974.zip | |
net: cdc_ether: fix divide by 0 on bad descriptors
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>
Diffstat (limited to 'drivers/net/usb/cdc_ether.c')
| -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 3e7a3ac3a362..05dca3e5c93d 100644 --- a/drivers/net/usb/cdc_ether.c +++ b/drivers/net/usb/cdc_ether.c @@ -230,7 +230,7 @@ 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. |