[PATCH 2/2] staging: rtl8712: fix interface sanity check

From: Johan Hovold <johan@kernel.org>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Larry Finger <Larry.Finger@lwfinger.net>,
	Florian Schilhabel <florian.c.schilhabel@googlemail.com>,
	devel@driverdev.osuosl.org, linux-usb@vger.kernel.org,
	linux-kernel@vger.kernel.org, Johan Hovold <johan@kernel.org>,
	stable <stable@vger.kernel.org>
Subject: [PATCH 2/2] staging: rtl8712: fix interface sanity check
Date: Tue, 10 Dec 2019 12:47:51 +0100	[thread overview]
Message-ID: <20191210114751.5119-3-johan@kernel.org> (raw)
In-Reply-To: <20191210114751.5119-1-johan@kernel.org>

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: 2865d42c78a9 ("staging: r8712u: Add the new driver to the mainline kernel")
Cc: stable <stable@vger.kernel.org>     # 2.6.37
Signed-off-by: Johan Hovold <johan@kernel.org>
---
 drivers/staging/rtl8712/usb_intf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/rtl8712/usb_intf.c b/drivers/staging/rtl8712/usb_intf.c
index ba1288297ee4..a87562f632a7 100644
--- a/drivers/staging/rtl8712/usb_intf.c
+++ b/drivers/staging/rtl8712/usb_intf.c
@@ -247,7 +247,7 @@ static uint r8712_usb_dvobj_init(struct _adapter *padapter)
 
 	pdvobjpriv->padapter = padapter;
 	padapter->eeprom_address_size = 6;
-	phost_iface = &pintf->altsetting[0];
+	phost_iface = pintf->cur_altsetting;
 	piface_desc = &phost_iface->desc;
 	pdvobjpriv->nr_endpoint = piface_desc->bNumEndpoints;
 	if (pusbd->speed == USB_SPEED_HIGH) {
-- 
2.24.0

