From: Sakari Ailus <sakari.ailus@linux.intel.com>
Date: Fri, 24 Feb 2023 16:00:46 +0100
Subject: [PATCH] media: v4l: subdev: Make link validation safer
References: bsc#1012628
Patch-mainline: 6.3.2
Git-commit: 55f1ecb1199000932cf82e357841cc7498ac904f
[ Upstream commit 55f1ecb1199000932cf82e357841cc7498ac904f ]
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@redhat.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Tested-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
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 b10045c0..9a0c2326 100644
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -1236,6 +1236,16 @@ int v4l2_subdev_link_validate(struct media_link *link)
struct v4l2_subdev_state *source_state, *sink_state;
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);
--
2.35.3