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    Subject[PATCH 3.2 18/95] uwb: hwa-rc: fix NULL-deref at probe
    3.2.91-rc1 review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Johan Hovold <johan@kernel.org>

    commit daf229b15907fbfdb6ee183aac8ca428cb57e361 upstream.

    Make sure to check the number of endpoints to avoid dereferencing a
    NULL-pointer should a malicious device lack endpoints.

    Note that the dereference happens in the start callback which is called
    during probe.

    Fixes: de520b8bd552 ("uwb: add HWA radio controller driver")
    Cc: Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
    Cc: David Vrabel <david.vrabel@csr.com>
    Signed-off-by: Johan Hovold <johan@kernel.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
    ---
    drivers/uwb/hwa-rc.c | 3 +++
    1 file changed, 3 insertions(+)

    --- a/drivers/uwb/hwa-rc.c
    +++ b/drivers/uwb/hwa-rc.c
    @@ -811,6 +811,9 @@ static int hwarc_probe(struct usb_interf
    struct hwarc *hwarc;
    struct device *dev = &iface->dev;

    + if (iface->cur_altsetting->desc.bNumEndpoints < 1)
    + return -ENODEV;
    +
    result = -ENOMEM;
    uwb_rc = uwb_rc_alloc();
    if (uwb_rc == NULL) {
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