linux-kernel - [PATCH 4.4 02/53] orinoco_usb: fix interface sanity check

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Message-Id: <20200203161903.457277571@linuxfoundation.org>
Date:   Mon,  3 Feb 2020 16:18:54 +0000
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Johan Hovold <johan@...nel.org>,
        Kalle Valo <kvalo@...eaurora.org>
Subject: [PATCH 4.4 02/53] orinoco_usb: fix interface sanity check

From: Johan Hovold <johan@...nel.org>

commit b73e05aa543cf8db4f4927e36952360d71291d41 upstream.

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>
Signed-off-by: Kalle Valo <kvalo@...eaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/net/wireless/orinoco/orinoco_usb.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/net/wireless/orinoco/orinoco_usb.c
+++ b/drivers/net/wireless/orinoco/orinoco_usb.c
@@ -1601,9 +1601,9 @@ static int ezusb_probe(struct usb_interf
 	/* 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 */