zd1211rw: fix storage endpoint lookup

commit 2d68bb2687abb747558b933e80845ff31570a49c upstream.

Make sure to use the current alternate setting when verifying the
storage interface descriptors to avoid submitting an URB to an invalid
endpoint.

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: a1030e92c150 ("[PATCH] zd1211rw: Convert installer CDROM device into WLAN device")
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
[bwh: Backported to 3.16: adjust filename]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/net/wireless/zd1211rw/zd_usb.c b/drivers/net/wireless/zd1211rw/zd_usb.c
index 8d621ee5f3492075ae31d17ecfd03d51b2378977..d51557809c608030c7a5292f0691091cf689fe14 100644 (file)
--- a/drivers/net/wireless/zd1211rw/zd_usb.c
+++ b/drivers/net/wireless/zd1211rw/zd_usb.c
@@ -1272,7 +1272,7 @@ static void print_id(struct usb_device *udev)
 static int eject_installer(struct usb_interface *intf)
 {
        struct usb_device *udev = interface_to_usbdev(intf);
-       struct usb_host_interface *iface_desc = &intf->altsetting[0];
+       struct usb_host_interface *iface_desc = intf->cur_altsetting;
        struct usb_endpoint_descriptor *endpoint;
        unsigned char *cmd;
        u8 bulk_out_ep;