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SubjectRe: [PATCH v5 2/4] media: v4l2-subdev: WARN_ON invalid v4l2_subdev_call() arguments
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On 5/12/19 10:15 PM, Janusz Krzysztofik wrote:
> Invalid arguments passed to v4l2_subdev_call generally mean bugs. Be
> noisy if that happens.
>
> Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
> ---
> drivers/media/v4l2-core/v4l2-subdev.c | 8 ++++----
> 1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
> index 890916674d42..5f2264575cd7 100644
> --- a/drivers/media/v4l2-core/v4l2-subdev.c
> +++ b/drivers/media/v4l2-core/v4l2-subdev.c
> @@ -122,8 +122,8 @@ static int subdev_close(struct file *file)
>
> static int check_which(__u32 which)
> {
> - if (which != V4L2_SUBDEV_FORMAT_TRY &&
> - which != V4L2_SUBDEV_FORMAT_ACTIVE)
> + if (WARN_ON(which != V4L2_SUBDEV_FORMAT_TRY &&
> + which != V4L2_SUBDEV_FORMAT_ACTIVE))
> return -EINVAL;

But this is now also called when the user calls an ioctl. And in that
case there should be no warning. It's perfectly legal for userspace to
specify a random value for which, and in that case it is just a regular
userspace bug. Same for the other checks below.

Regards,

Hans

>
> return 0;
> @@ -132,7 +132,7 @@ static int check_which(__u32 which)
> static int check_pad(struct v4l2_subdev *sd, __u32 pad)
> {
> #if defined(CONFIG_MEDIA_CONTROLLER)
> - if (sd->entity.num_pads && pad >= sd->entity.num_pads)
> + if (WARN_ON(sd->entity.num_pads && pad >= sd->entity.num_pads))
> return -EINVAL;
> #endif
> return 0;
> @@ -228,7 +228,7 @@ static int check_set_selection(struct v4l2_subdev *sd,
>
> static int check_edid(struct v4l2_subdev *sd, struct v4l2_subdev_edid *edid)
> {
> - if (edid->blocks && edid->edid == NULL)
> + if (WARN_ON(edid->blocks && edid->edid == NULL))
> return -EINVAL;
>
> return check_pad(sd, edid->pad);
>

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