rsi_91x_usb: fix interface sanity check

BugLink: https://bugs.launchpad.net/bugs/1864904
commit 3139b180906af43bc09bd3373fc2338a8271d9d9 upstream.

Make sure to use the current alternate setting when verifying the
interface descriptors to avoid binding to an invalid interface.

Failing to do so could cause the driver to misbehave or trigger a WARN()
in usb_submit_urb() that kernels with panic_on_warn set would choke on.

Fixes: dad0d04fa7ba ("rsi: Add RS9113 wireless driver")
Cc: stable <stable@vger.kernel.org>     # 3.15
Cc: Fariya Fatima <fariyaf@gmail.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

diff --git a/drivers/net/wireless/rsi/rsi_91x_usb.c b/drivers/net/wireless/rsi/rsi_91x_usb.c
index 8f84438333482c8c51ee32648f7aa37be5f5dc06..e5b5a21b0a1346e72e42ff3ed5a218bdc6cc013b 100644 (file)
--- a/drivers/net/wireless/rsi/rsi_91x_usb.c
+++ b/drivers/net/wireless/rsi/rsi_91x_usb.c
@@ -105,7 +105,7 @@ static int rsi_find_bulk_in_and_out_endpoints(struct usb_interface *interface,
        __le16 buffer_size;
        int ii, bep_found = 0;
 
-       iface_desc = &(interface->altsetting[0]);
+       iface_desc = interface->cur_altsetting;
 
        for (ii = 0; ii < iface_desc->desc.bNumEndpoints; ++ii) {
                endpoint = &(iface_desc->endpoint[ii].desc);