Link validation currently accesses invalid pointers if the link passed to
it is not between two sub-devices. This is of course a driver bug.
Ignore the error but print a warning message, as this is how it used to
work previously.
Fixes: a6b995ed03ff ("media: subdev: use streams in v4l2_subdev_link_validate()")
Reported-by: Hans de Goede <hdegoede@xxxxxxxxxx>
Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
Tested-by: Hans de Goede <hdegoede@xxxxxxxxxx>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@xxxxxxxxxxxxxxxx>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx>
---
since v2:
- Print the entire link and the problematic end of it.
drivers/media/v4l2-core/v4l2-subdev.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
index 03dc5f68ffad6..c7154a7f696a7 100644
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -1258,6 +1258,16 @@ int v4l2_subdev_link_validate(struct media_link *link)
bool states_locked;
int ret;
+ if (!is_media_entity_v4l2_subdev(link->sink->entity) ||
+ !is_media_entity_v4l2_subdev(link->source->entity)) {
+ pr_warn_once("%s of link '%s':%u->'%s':%u is not a V4L2 sub-device, driver bug!\n",
+ !is_media_entity_v4l2_subdev(link->sink->entity) ?
+ "sink" : "source",
+ link->source->entity->name, link->source->index,
+ link->sink->entity->name, link->sink->index);
+ return 0;
+ }
+
sink_sd = media_entity_to_v4l2_subdev(link->sink->entity);
source_sd = media_entity_to_v4l2_subdev(link->source->entity);
--
2.30.2
