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net: wimax/i2400m: fix NULL-deref at probe

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Make sure to check the number of endpoints to avoid dereferencing a
NULL-pointer or accessing memory beyond the endpoint array should a
malicious device lack the expected endpoints.

The endpoints are specifically dereferenced in the i2400m_bootrom_init
path during probe (e.g. in i2400mu_tx_bulk_out).

Fixes: f398e4240f ("i2400m/USB: probe/disconnect, dev init/shutdown
and reset backends")
Cc: Inaky Perez-Gonzalez <inaky@linux.intel.com>

Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Johan Hovold 2017-03-13 13:42:03 +01:00 committed by David S. Miller
parent 68c32f9c2a
commit 6e526fdff7
1 changed files with 3 additions and 0 deletions
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3
drivers/net/wimax/i2400m/usb.c
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@ -467,6 +467,9 @@ int i2400mu_probe(struct usb_interface *iface,
struct i2400mu *i2400mu;
struct usb_device *usb_dev = interface_to_usbdev(iface);
if (iface->cur_altsetting->desc.bNumEndpoints < 4)
return -ENODEV;
if (usb_dev->speed != USB_SPEED_HIGH)
dev_err(dev, "device not connected as high speed\n");