staging: rtl8188eu: fix interface sanity check

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: c2478d39076b ("staging: r8188eu: Add files for new driver - part 20")
Cc: stable <stable@vger.kernel.org>     # 3.12
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20191210114751.5119-2-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/rtl8188eu/os_dep/usb_intf.c b/drivers/staging/rtl8188eu/os_dep/usb_intf.c
index 4fac9dca798e812d8f4315baff14193fb6fcf13f..a7cac0719b8bcb322ed6af3ffa2e925352bd9572 100644 (file)
--- a/drivers/staging/rtl8188eu/os_dep/usb_intf.c
+++ b/drivers/staging/rtl8188eu/os_dep/usb_intf.c
@@ -70,7 +70,7 @@ static struct dvobj_priv *usb_dvobj_init(struct usb_interface *usb_intf)
        phost_conf = pusbd->actconfig;
        pconf_desc = &phost_conf->desc;
 
-       phost_iface = &usb_intf->altsetting[0];
+       phost_iface = usb_intf->cur_altsetting;
        piface_desc = &phost_iface->desc;
 
        pdvobjpriv->NumInterfaces = pconf_desc->bNumInterfaces;