| Message ID | 20200728121031.12323-2-johan@kernel.org (mailing list archive) |
|---|---|
| State | Mainlined |
| Commit | 8d8e95fd6d69d774013f51e5f2ee10c6e6d1fc14 |
| Headers | show |
| Series | net: lan78xx: fix NULL deref and memory leak | expand |
diff --git a/drivers/net/usb/lan78xx.c b/drivers/net/usb/lan78xx.c index eccbf4cd7149..d7162690e3f3 100644 --- a/drivers/net/usb/lan78xx.c +++ b/drivers/net/usb/lan78xx.c @@ -3759,6 +3759,11 @@ static int lan78xx_probe(struct usb_interface *intf, netdev->max_mtu = MAX_SINGLE_PACKET_SIZE; netif_set_gso_max_size(netdev, MAX_SINGLE_PACKET_SIZE - MAX_HEADER); + if (intf->cur_altsetting->desc.bNumEndpoints < 3) { + ret = -ENODEV; + goto out3; + } + dev->ep_blkin = (intf->cur_altsetting)->endpoint + 0; dev->ep_blkout = (intf->cur_altsetting)->endpoint + 1; dev->ep_intr = (intf->cur_altsetting)->endpoint + 2;
Add the missing endpoint sanity check to prevent a NULL-pointer dereference should a malicious device lack the expected endpoints. Note that the driver has a broken endpoint-lookup helper, lan78xx_get_endpoints(), which can end up accepting interfaces in an altsetting without endpoints as long as *some* altsetting has a bulk-in and a bulk-out endpoint. Fixes: 55d7de9de6c3 ("Microchip's LAN7800 family USB 2/3 to 10/100/1000 Ethernet device driver") Cc: Woojung.Huh@microchip.com <Woojung.Huh@microchip.com> Signed-off-by: Johan Hovold <johan@kernel.org> --- drivers/net/usb/lan78xx.c | 5 +++++ 1 file changed, 5 insertions(+)