USB: iowarrior: fix NULL-deref in write
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 <stable@vger.kernel.org> # 2.6.21
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -798,6 +798,14 @@ static int iowarrior_probe(struct usb_interface *interface,
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goto error;
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}
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if (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW56) {
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if (!dev->int_out_endpoint) {
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dev_err(&interface->dev, "no interrupt-out endpoint found\n");
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retval = -ENODEV;
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goto error;
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}
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}
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/* we have to check the report_size often, so remember it in the endianness suitable for our machine */
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dev->report_size = usb_endpoint_maxp(dev->int_in_endpoint);
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if ((dev->interface->cur_altsetting->desc.bInterfaceNumber == 0) &&
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