[media] ivtv: ivtv_write_vbi() should use copy_from_user() for user data buffers

ivtv_write_vbi() is used for both VBI data that came from the
driver internally and VBI data that came from the user.  However,
it did not use copy_from_user() for reading the VBI data from the
user buffers.

This change adds a new version of the function,
ivtv_write_vbi_from_user(), that uses copy_from_user() to read the VBI
data provided via user buffers.

This should resolve a sparse build warning reported by Dave Gilbert.

Reported-by: Dr. David Alan Gilbert <linux at treblig.org>
Signed-off-by: Andy Walls <awalls@md.metrocast.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/media/video/ivtv/ivtv-vbi.h b/drivers/media/video/ivtv/ivtv-vbi.h
index 970567b..eda38d0 100644
--- a/drivers/media/video/ivtv/ivtv-vbi.h
+++ b/drivers/media/video/ivtv/ivtv-vbi.h
@@ -20,7 +20,9 @@
 #ifndef IVTV_VBI_H
 #define IVTV_VBI_H
 
-void ivtv_write_vbi(struct ivtv *itv, const struct v4l2_sliced_vbi_data *sliced, size_t count);
+void ivtv_write_vbi_from_user(struct ivtv *itv,
+			      const struct v4l2_sliced_vbi_data __user *sliced,
+			      size_t count);
 void ivtv_process_vbi_data(struct ivtv *itv, struct ivtv_buffer *buf,
 			   u64 pts_stamp, int streamtype);
 int ivtv_used_line(struct ivtv *itv, int line, int field);