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media: dib0700: fix rc endpoint lookup 

commit f52981019a upstream.

Make sure to use the current alternate setting when verifying the
interface descriptors to avoid submitting an URB to an invalid endpoint.

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: c4018fa2e4 ("[media] dib0700: fix RC support on Hauppauge Nova-TD")
Cc: stable <stable@vger.kernel.org>     # 3.16
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2020-01-03 17:35:12 +01:00 committed by Greg Kroah-Hartman
parent e4af1cf37b
commit d111431a44
1 changed files with 2 additions and 2 deletions
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4
drivers/media/usb/dvb-usb/dib0700_core.c
View File

@ -818,7 +818,7 @@ int dib0700_rc_setup(struct dvb_usb_device *d, struct usb_interface *intf)
/* Starting in firmware 1.20, the RC info is provided on a bulk pipe */
if (intf->altsetting[0].desc.bNumEndpoints < rc_ep + 1)
if (intf->cur_altsetting->desc.bNumEndpoints < rc_ep + 1)
return -ENODEV;
purb = usb_alloc_urb(0, GFP_KERNEL);
@ -838,7 +838,7 @@ int dib0700_rc_setup(struct dvb_usb_device *d, struct usb_interface *intf)
* Some devices like the Hauppauge NovaTD model 52009 use an interrupt
* endpoint, while others use a bulk one.
*/
e = &intf->altsetting[0].endpoint[rc_ep].desc;
e = &intf->cur_altsetting->endpoint[rc_ep].desc;
if (usb_endpoint_dir_in(e)) {
if (usb_endpoint_xfer_bulk(e)) {
pipe = usb_rcvbulkpipe(d->udev, rc_ep);