linux-kernel - Re: [PATCH] media: flexcop-usb: fix endpoint type check

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Message-ID: <YsvyEexuZsINiARm@hovoldconsulting.com>
Date:   Mon, 11 Jul 2022 11:49:05 +0200
From:   Johan Hovold <johan@...nel.org>
To:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>
Cc:     Sean Young <sean@...s.org>, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org, Oliver Neukum <oneukum@...e.com>,
        stable@...r.kernel.org, Dongliang Mu <mudongliangabcd@...il.com>
Subject: Re: [PATCH] media: flexcop-usb: fix endpoint type check

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@...e.com>
> Cc: stable@...r.kernel.org	# 5.9
> Reported-by: Dongliang Mu <mudongliangabcd@...il.com>
> Signed-off-by: Johan Hovold <johan@...nel.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