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-maestro.c b/drivers/media/radio/radio-maestro.c
index 64d737c35acf..f8213b7c8ddc 100644
--- a/drivers/media/radio/radio-maestro.c
+++ b/drivers/media/radio/radio-maestro.c
@@ -200,6 +200,8 @@ static int vidioc_s_frequency(struct file *file, void *priv,
 {
         struct maestro *dev = video_drvdata(file);
 
+        if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
+                return -EINVAL;
         if (f->frequency < FREQ_LO || f->frequency > FREQ_HI)
                 return -EINVAL;
         mutex_lock(&dev->lock);
@@ -213,6 +215,8 @@ static int vidioc_g_frequency(struct file *file, void *priv,
 {
         struct maestro *dev = video_drvdata(file);
 
+        if (f->tuner != 0)
+                return -EINVAL;
         f->type = V4L2_TUNER_RADIO;
         mutex_lock(&dev->lock);
         f->frequency = BITS2FREQ(radio_bits_get(dev));