linux-kernel - [PATCH 3.16 27/99] orinoco_usb: fix interface sanity check

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Message-ID: <lsq.1589984008.724581902@decadent.org.uk>
Date:   Wed, 20 May 2020 15:13:55 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Johan Hovold" <johan@...nel.org>,
        "Kalle Valo" <kvalo@...eaurora.org>
Subject: [PATCH 3.16 27/99] orinoco_usb: fix interface sanity check

3.16.84-rc1 review patch.  If anyone has any objections, please let me know.

------------------

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")
Signed-off-by: Johan Hovold <johan@...nel.org>
Signed-off-by: Kalle Valo <kvalo@...eaurora.org>
[bwh: Backported to 3.16: adjust filename]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 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
@@ -1602,9 +1602,9 @@ 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 (((ep->bEndpointAddress & USB_ENDPOINT_DIR_MASK)
 		     == USB_DIR_IN) &&