On 3/13/24 08:24, Sakari Ailus wrote:
As the user needs to know what went wrong for S_ROUTING, copy array
arguments back to the user.
Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
Reviewed-by: Julien Massot <julien.massot@xxxxxxxxxxxxx>
---
drivers/media/v4l2-core/v4l2-ioctl.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
index d125d23e4e61..95bd56145d38 100644
--- a/drivers/media/v4l2-core/v4l2-ioctl.c
+++ b/drivers/media/v4l2-core/v4l2-ioctl.c
@@ -3415,11 +3415,14 @@ video_usercopy(struct file *file, unsigned int orig_cmd, unsigned long arg,
* FIXME: subdev IOCTLS are partially handled here and partially in
* v4l2-subdev.c and the 'always_copy' flag can only be set for IOCTLS
* defined here as part of the 'v4l2_ioctls' array. As
- * VIDIOC_SUBDEV_G_ROUTING needs to return results to applications even
- * in case of failure, but it is not defined here as part of the
+ * VIDIOC_SUBDEV_[GS]_ROUTING needs to return results to applications
+ * even in case of failure, but it is not defined here as part of the
* 'v4l2_ioctls' array, insert an ad-hoc check to address that.
*/
- if (err < 0 && !always_copy && cmd != VIDIOC_SUBDEV_G_ROUTING)
+ if (cmd == VIDIOC_SUBDEV_G_ROUTING || cmd == VIDIOC_SUBDEV_S_ROUTING)
+ always_copy = true;
+
+ if (err < 0 && !always_copy)
goto out;
if (has_array_args) {
--
Julien Massot
Senior Software Engineer
Collabora Ltd.
Platinum Building, St John's Innovation Park, Cambridge CB4 0DS, UK
Registered in England & Wales, no. 5513718
