linux-kernel - [PATCH 6/6] media: iguanair: fix endpoint sanity check

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Date:   Fri,  3 Jan 2020 17:35:13 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     Sean Young <sean@...s.org>, Hans Verkuil <hverkuil@...all.nl>,
        linux-media@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, Johan Hovold <johan@...nel.org>,
        stable <stable@...r.kernel.org>, Oliver Neukum <oneukum@...e.com>
Subject: [PATCH 6/6] media: iguanair: fix endpoint sanity check

Make sure to use the current alternate setting, which need not be the
first one by index, when verifying the endpoint descriptors and
initialising the URBs.

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: 26ff63137c45 ("[media] Add support for the IguanaWorks USB IR Transceiver")
Fixes: ab1cbdf159be ("media: iguanair: add sanity checks")
Cc: stable <stable@...r.kernel.org>     # 3.6
Cc: Sean Young <sean@...s.org>
Cc: Oliver Neukum <oneukum@...e.com>
Signed-off-by: Johan Hovold <johan@...nel.org>
---
 drivers/media/rc/iguanair.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/rc/iguanair.c b/drivers/media/rc/iguanair.c
index 872d6441e512..a7deca1fefb7 100644
--- a/drivers/media/rc/iguanair.c
+++ b/drivers/media/rc/iguanair.c
@@ -413,7 +413,7 @@ static int iguanair_probe(struct usb_interface *intf,
 	int ret, pipein, pipeout;
 	struct usb_host_interface *idesc;
 
-	idesc = intf->altsetting;
+	idesc = intf->cur_altsetting;
 	if (idesc->desc.bNumEndpoints < 2)
 		return -ENODEV;
 
-- 
2.24.1