V4L/DVB (13547): radio: add trivial checks on the tuner and type args.

Many radio drivers did not check the tuner and type field correctly
for g/s_frequency. These checks have now been added.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/media/radio/radio-mr800.c b/drivers/media/radio/radio-mr800.c
index 949f60513d9e..02a9cefc9a00 100644
--- a/drivers/media/radio/radio-mr800.c
+++ b/drivers/media/radio/radio-mr800.c
@@ -374,6 +374,8 @@ static int vidioc_s_frequency(struct file *file, void *priv,
 {
         struct amradio_device *radio = file->private_data;
 
+        if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
+                return -EINVAL;
         return amradio_setfreq(radio, f->frequency);
 }
 
@@ -383,6 +385,8 @@ static int vidioc_g_frequency(struct file *file, void *priv,
 {
         struct amradio_device *radio = file->private_data;
 
+        if (f->tuner != 0)
+                return -EINVAL;
         f->type = V4L2_TUNER_RADIO;
         f->frequency = radio->curfreq;