On Thu, Jun 09, 2022 at 03:53:41PM +0200, Johan Hovold wrote:

Commit d725d20e81c2 ("media: flexcop-usb: sanity checking of endpoint type") tried to add an endpoint type sanity check for the single isochronous endpoint but instead broke the driver by checking the wrong descriptor or random data beyond the last endpoint descriptor.

Make sure to check the right endpoint descriptor.

Fixes: d725d20e81c2 ("media: flexcop-usb: sanity checking of endpoint type") Cc: Oliver Neukum oneukum@suse.com Cc: stable@vger.kernel.org # 5.9 Reported-by: Dongliang Mu mudongliangabcd@gmail.com Signed-off-by: Johan Hovold johan@kernel.org

---

I haven't received any notification about this one being added to any tree and the status is still set to "NEW" in the patch tracker so sending a reminder.

drivers/media/usb/b2c2/flexcop-usb.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/usb/b2c2/flexcop-usb.c b/drivers/media/usb/b2c2/flexcop-usb.c index 7835bb0f32fc..e012b21c4fd7 100644 --- a/drivers/media/usb/b2c2/flexcop-usb.c +++ b/drivers/media/usb/b2c2/flexcop-usb.c @@ -511,7 +511,7 @@ static int flexcop_usb_init(struct flexcop_usb *fc_usb) if (fc_usb->uintf->cur_altsetting->desc.bNumEndpoints < 1) return -ENODEV;

• if (!usb_endpoint_is_isoc_in(&fc_usb->uintf->cur_altsetting->endpoint[1].desc))

• if (!usb_endpoint_is_isoc_in(&fc_usb->uintf->cur_altsetting->endpoint[0].desc)) return -ENODEV;

switch (fc_usb->udev->speed) {

Johan