[media] v4l2-ioctl.c: check for valid tuner type in S_HW_FREQ_SEEK

Prohibit attempts to change the tuner to a type that is different
from the device node the ioctl is called from. I.e. the type must
be RADIO for a radio node and ANALOG_TV for a video/vbi node.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/video/v4l2-ioctl.c b/drivers/media/video/v4l2-ioctl.c
index a2e442ab8a5b079cd76a7967ab0160de9fc29a4a..69e8c6ffcc49b8b64700c8049acaf0b172d25350 100644 (file)
--- a/drivers/media/video/v4l2-ioctl.c
+++ b/drivers/media/video/v4l2-ioctl.c
@@ -1946,13 +1946,19 @@ static long __video_do_ioctl(struct file *file,
        case VIDIOC_S_HW_FREQ_SEEK:
        {
                struct v4l2_hw_freq_seek *p = arg;
+               enum v4l2_tuner_type type;
 
                if (!ops->vidioc_s_hw_freq_seek)
                        break;
+               type = (vfd->vfl_type == VFL_TYPE_RADIO) ?
+                       V4L2_TUNER_RADIO : V4L2_TUNER_ANALOG_TV;
                dbgarg(cmd,
-                       "tuner=%d, type=%d, seek_upward=%d, wrap_around=%d\n",
-                       p->tuner, p->type, p->seek_upward, p->wrap_around);
-               ret = ops->vidioc_s_hw_freq_seek(file, fh, p);
+                       "tuner=%u, type=%u, seek_upward=%u, wrap_around=%u, spacing=%u\n",
+                       p->tuner, p->type, p->seek_upward, p->wrap_around, p->spacing);
+               if (p->type != type)
+                       ret = -EINVAL;
+               else
+                       ret = ops->vidioc_s_hw_freq_seek(file, fh, p);
                break;
        }
        case VIDIOC_ENUM_FRAMESIZES: