Am Wed, 1 Nov 2017 17:05:39 -0400
schrieb Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxxx>:
> As smatch warned:
> drivers/media/dvb-core/dvb_frontend.c:2468
> dvb_frontend_handle_ioctl() error: uninitialized symbol 'err'.
>
> The ioctl handler actually got a regression here: before changeset
> d73dcf0cdb95 ("media: dvb_frontend: cleanup ioctl handling logic"),
> the code used to return -EOPNOTSUPP if an ioctl handler was not
> implemented on a driver. After the change, it may return a random
> value.
>
> Fixes: d73dcf0cdb95 ("media: dvb_frontend: cleanup ioctl handling
> logic") # For 4.14
> Cc: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxxx>
> ---
> drivers/media/dvb-core/dvb_frontend.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/media/dvb-core/dvb_frontend.c
> b/drivers/media/dvb-core/dvb_frontend.c index
> daaf969719e4..bcf0cbcbf7b2 100644 ---
> a/drivers/media/dvb-core/dvb_frontend.c +++
> b/drivers/media/dvb-core/dvb_frontend.c @@ -2109,7 +2109,7 @@ static
> int dvb_frontend_handle_ioctl(struct file *file, struct dvb_frontend
> *fe = dvbdev->priv; struct dvb_frontend_private *fepriv =
> fe->frontend_priv; struct dtv_frontend_properties *c =
> &fe->dtv_property_cache;
> - int i, err;
> + int i, err = -EOPNOTSUPP;
>
> dev_dbg(fe->dvb->device, "%s:\n", __func__);
>
> @@ -2144,6 +2144,7 @@ static int dvb_frontend_handle_ioctl(struct
> file *file, }
> }
> kfree(tvp);
> + err = 0;
> break;
> }
> case FE_GET_PROPERTY: {
> @@ -2195,6 +2196,7 @@ static int dvb_frontend_handle_ioctl(struct
> file *file, return -EFAULT;
> }
> kfree(tvp);
> + err = 0;
> break;
> }
>
Tested-by: Daniel Scheller <d.scheller@xxxxxxx>
Fixes false reporting of successful DVBv3 signal stats inquiry when
they're not available, causing wrong assumptions and values in userspace
apps.
Best regards,
Daniel Scheller
--
https://github.com/herrnst
