If the subdev did not define any controls, then return -ENOTTY if
userspace attempts to call these ioctls.
The control framework functions will return -EINVAL, not -ENOTTY if
vfh->ctrl_handler is NULL.
Several of these framework functions are also called directly from
drivers, so I don't want to change the error code there.
Found with vimc and v4l2-compliance.
Signed-off-by: Hans Verkuil <hans.verk...@cisco.com>
Acked-by: Sakari Ailus <sakari.ai...@linux.intel.com>
---
drivers/media/v4l2-core/v4l2-subdev.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/drivers/media/v4l2-core/v4l2-subdev.c
b/drivers/media/v4l2-core/v4l2-subdev.c
index c5639817db34..b14c5e1705ca 100644
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -187,27 +187,51 @@ static long subdev_do_ioctl(struct file *file, unsigned
int cmd, void *arg)
switch (cmd) {
case VIDIOC_QUERYCTRL:
+ /*
+ * TODO: this really should be folded into v4l2_queryctrl (this
+ * currently returns -EINVAL for NULL control handlers).
+ * However, v4l2_queryctrl() is still called directly by
+ * drivers as well and until that has been addressed I believe
+ * it is safer to do the check here. The same is true for the
+ * other control ioctls below.
+ */
+ if (!vfh->ctrl_handler)
+ return -ENOTTY;
return v4l2_queryctrl(vfh->ctrl_handler, arg);
case VIDIOC_QUERY_EXT_CTRL:
+ if (!vfh->ctrl_handler)
+ return -ENOTTY;
return v4l2_query_ext_ctrl(vfh->ctrl_handler, arg);
case VIDIOC_QUERYMENU:
+ if (!vfh->ctrl_handler)
+ return -ENOTTY;
return v4l2_querymenu(vfh->ctrl_handler, arg);
case VIDIOC_G_CTRL:
+ if (!vfh->ctrl_handler)
+ return -ENOTTY;
return v4l2_g_ctrl(vfh->ctrl_handler, arg);
case VIDIOC_S_CTRL:
+ if (!vfh->ctrl_handler)
+ return -ENOTTY;
return v4l2_s_ctrl(vfh, vfh->ctrl_handler, arg);
case VIDIOC_G_EXT_CTRLS:
+ if (!vfh->ctrl_handler)
+ return -ENOTTY;
return v4l2_g_ext_ctrls(vfh->ctrl_handler, arg);
case VIDIOC_S_EXT_CTRLS:
+ if (!vfh->ctrl_handler)
+ return -ENOTTY;
return v4l2_s_ext_ctrls(vfh, vfh->ctrl_handler, arg);
case VIDIOC_TRY_EXT_CTRLS:
+ if (!vfh->ctrl_handler)
+ return -ENOTTY;
return v4l2_try_ext_ctrls(vfh->ctrl_handler, arg);
case VIDIOC_DQEVENT:
--
2.16.1
