linux-kernel - [PATCH 4/7] orinoco_usb: fix interface sanity check

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Message-Id: <20191210114426.4713-5-johan@kernel.org>
Date:   Tue, 10 Dec 2019 12:44:23 +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>
Subject: [PATCH 4/7] orinoco_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: 9afac70a7305 ("orinoco: add orinoco_usb driver")
Cc: stable <stable@...r.kernel.org>     # 2.6.35
Signed-off-by: Johan Hovold <johan@...nel.org>
---
 drivers/net/wireless/intersil/orinoco/orinoco_usb.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/intersil/orinoco/orinoco_usb.c b/drivers/net/wireless/intersil/orinoco/orinoco_usb.c
index 40a8b941ad5c..8c79b963bcff 100644
--- a/drivers/net/wireless/intersil/orinoco/orinoco_usb.c
+++ b/drivers/net/wireless/intersil/orinoco/orinoco_usb.c
@@ -1608,9 +1608,9 @@ static int ezusb_probe(struct usb_interface *interface,
 	/* set up the endpoint information */
 	/* check out the endpoints */
 
-	iface_desc = &interface->altsetting[0].desc;
+	iface_desc = &interface->cur_altsetting->desc;
 	for (i = 0; i < iface_desc->bNumEndpoints; ++i) {
-		ep = &interface->altsetting[0].endpoint[i].desc;
+		ep = &interface->cur_altsetting->endpoint[i].desc;
 
 		if (usb_endpoint_is_bulk_in(ep)) {
 			/* we found a bulk in endpoint */
-- 
2.24.0