[PATCH 1/1] v4l: subdev: Fail graciously when getting try data for NULL state

[Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>]

The state argument for the functions for obtaining various parts of the
state is NULL if it is called by drivers for active state. Fail graciously
in that case instead of dereferencing a NULL pointer.

Suggested-by: Bingbu Cao <bingbu.cao@xxxxxxxxx>
Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
---
 include/media/v4l2-subdev.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index 9689f38a0af1f..ec1896886dbd6 100644
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -1046,6 +1046,8 @@ v4l2_subdev_get_pad_format(struct v4l2_subdev *sd,
 			   struct v4l2_subdev_state *state,
 			   unsigned int pad)
 {
+	if (WARN_ON(!state))
+		return NULL;
 	if (WARN_ON(pad >= sd->entity.num_pads))
 		pad = 0;
 	return &state->pads[pad].try_fmt;
@@ -1064,6 +1066,8 @@ v4l2_subdev_get_pad_crop(struct v4l2_subdev *sd,
 			 struct v4l2_subdev_state *state,
 			 unsigned int pad)
 {
+	if (WARN_ON(!state))
+		return NULL;
 	if (WARN_ON(pad >= sd->entity.num_pads))
 		pad = 0;
 	return &state->pads[pad].try_crop;
@@ -1082,6 +1086,8 @@ v4l2_subdev_get_pad_compose(struct v4l2_subdev *sd,
 			    struct v4l2_subdev_state *state,
 			    unsigned int pad)
 {
+	if (WARN_ON(!state))
+		return NULL;
 	if (WARN_ON(pad >= sd->entity.num_pads))
 		pad = 0;
 	return &state->pads[pad].try_compose;
-- 
2.30.2