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media: v4l: subdev: Fail graciously when getting try data for NULL state 

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@intel.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
This commit is contained in:
Sakari Ailus 2022-08-26 13:53:58 +02:00 committed by Mauro Carvalho Chehab
parent b9eb3ab6f3
commit 2ba3e38517
1 changed files with 6 additions and 0 deletions
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6
include/media/v4l2-subdev.h
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@ -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;