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-aztech.c b/drivers/media/radio/radio-aztech.c
index 8daf809eb01a..c22311393624 100644
--- a/drivers/media/radio/radio-aztech.c
+++ b/drivers/media/radio/radio-aztech.c
@@ -254,6 +254,8 @@ static int vidioc_s_frequency(struct file *file, void *priv,
 {
         struct aztech *az = video_drvdata(file);
 
+        if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
+                return -EINVAL;
         az_setfreq(az, f->frequency);
         return 0;
 }
@@ -263,6 +265,8 @@ static int vidioc_g_frequency(struct file *file, void *priv,
 {
         struct aztech *az = video_drvdata(file);
 
+        if (f->tuner != 0)
+                return -EINVAL;
         f->type = V4L2_TUNER_RADIO;
         f->frequency = az->curfreq;
         return 0;