Subject: [PATCH 5/7] rtl8xxxu: fix interface sanity check

From: Johan Hovold <[email-masked]>
Date: Tue, 10 Dec 2019 12:44:24 +0100

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: 26f1fad29ad9 ("New driver: rtl8xxxu (mac80211)")
Cc: stable <[email-masked]>     # 4.4
Cc: Jes Sorensen <[email-masked]>
Signed-off-by: Johan Hovold <[email-masked]>
---
 drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
index aa2bb2ae9809..54a1a4ea107b 100644
--- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
+++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
@@ -6384,7 +6384,7 @@ static int rtl8xxxu_parse_usb(struct rtl8xxxu_priv *priv,
 	u8 dir, xtype, num;
 	int ret = 0;
 
-	host_interface = &interface->altsetting[0];
+	host_interface = interface->cur_altsetting;
 	interface_desc = &host_interface->desc;
 	endpoints = interface_desc->bNumEndpoints;
 
-- 
2.24.0