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USB: iowarrior: fix NULL-deref in write

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Make sure to verify that we have the required interrupt-out endpoint for
IOWarrior56 devices to avoid dereferencing a NULL-pointer in write
should a malicious device lack such an endpoint.

Fixes: 946b960d13 ("USB: add driver for iowarrior devices.")
Cc: stable <[email protected]>     # 2.6.21
Signed-off-by: Johan Hovold <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Johan Hovold 2017-03-07 16:11:04 +01:00 • committed by Greg Kroah-Hartman
commit de46e56653
1 changed files with 8 additions and 0 deletions
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8
drivers/usb/misc/iowarrior.c
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@ -798,6 +798,14 @@ static int iowarrior_probe(struct usb_interface *interface,
goto error;
}
if (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW56) {
if (!dev->int_out_endpoint) {
dev_err(&interface->dev, "no interrupt-out endpoint found\n");
retval = -ENODEV;
goto error;
}
}
/* we have to check the report_size often, so remember it in the endianness suitable for our machine */
dev->report_size = usb_endpoint_maxp(dev->int_in_endpoint);
if ((dev->interface->cur_altsetting->desc.bInterfaceNumber == 0) &&