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Subject: media: dvb_frontend: be sure to init dvb_frontend_handle_ioctl() return code Author: Mauro Carvalho Chehab mchehab@s-opensource.com Date: Wed Nov 1 17:05:39 2017 -0400

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")

Cc: stable@vger.kernel.org Signed-off-by: Mauro Carvalho Chehab mchehab@s-opensource.com Tested-by: Daniel Scheller d.scheller@gmx.net Signed-off-by: Mauro Carvalho Chehab mchehab@s-opensource.com

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 2afaa8226342..46f977177faf 100644 --- a/drivers/media/dvb-core/dvb_frontend.c +++ b/drivers/media/dvb-core/dvb_frontend.c @@ -2110,7 +2110,7 @@ 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__);

@@ -2145,6 +2145,7 @@ static int dvb_frontend_handle_ioctl(struct file *file, } } kfree(tvp); + err = 0; break; } case FE_GET_PROPERTY: { @@ -2196,6 +2197,7 @@ static int dvb_frontend_handle_ioctl(struct file *file, return -EFAULT; } kfree(tvp); + err = 0; break; }