netdev - [PATCH 6/7] rsi_91x_usb: fix interface sanity check

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Message-Id: <20191210114426.4713-7-johan@kernel.org>
Date:   Tue, 10 Dec 2019 12:44:25 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Kalle Valo <kvalo@...eaurora.org>
Cc:     QCA ath9k Development <ath9k-devel@....qualcomm.com>,
        Arend van Spriel <arend@...adcom.com>,
        Franky Lin <franky.lin@...adcom.com>,
        Hante Meuleman <hante.meuleman@...adcom.com>,
        Chi-Hsien Lin <chi-hsien.lin@...ress.com>,
        Wright Feng <wright.feng@...ress.com>,
        Jes Sorensen <Jes.Sorensen@...hat.com>,
        Amitkumar Karwar <amitkarwar@...il.com>,
        Siva Rebbagondla <siva8118@...il.com>,
        Daniel Drake <dsd@...too.org>,
        Ulrich Kunitz <kune@...ne-taler.de>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Johan Hovold <johan@...nel.org>,
        stable <stable@...r.kernel.org>,
        Fariya Fatima <fariyaf@...il.com>
Subject: [PATCH 6/7] rsi_91x_usb: 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: dad0d04fa7ba ("rsi: Add RS9113 wireless driver")
Cc: stable <stable@...r.kernel.org>     # 3.15
Cc: Fariya Fatima <fariyaf@...il.com>
Signed-off-by: Johan Hovold <johan@...nel.org>
---
 drivers/net/wireless/rsi/rsi_91x_usb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/rsi/rsi_91x_usb.c b/drivers/net/wireless/rsi/rsi_91x_usb.c
index a37a436df5fb..c3ba38ed0dd0 100644
--- a/drivers/net/wireless/rsi/rsi_91x_usb.c
+++ b/drivers/net/wireless/rsi/rsi_91x_usb.c
@@ -117,7 +117,7 @@ static int rsi_find_bulk_in_and_out_endpoints(struct usb_interface *interface,
 	__le16 buffer_size;
 	int ii, bin_found = 0, bout_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);
-- 
2.24.0