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

[ Upstream commit 2ba3e38517f5a4ebf9c997168079dca01b7f9fc6 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index 95ec18c2f49ce96728a4575d06b5c2774fa680fd..9a476f902c4259011f103c30830014b24a67339a 100644 (file)
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -995,6 +995,8 @@ v4l2_subdev_get_try_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;
@@ -1013,6 +1015,8 @@ v4l2_subdev_get_try_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;
@@ -1031,6 +1035,8 @@ v4l2_subdev_get_try_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;