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Subject: media: mc: Fix graph walk in media_pipeline_start Author: Tomi Valkeinen tomi.valkeinen@ideasonboard.com Date: Mon Mar 18 11:50:59 2024 +0200

The graph walk tries to follow all links, even if they are not between pads. This causes a crash with, e.g. a MEDIA_LNK_FL_ANCILLARY_LINK link.

Fix this by allowing the walk to proceed only for MEDIA_LNK_FL_DATA_LINK links.

Signed-off-by: Tomi Valkeinen tomi.valkeinen@ideasonboard.com Cc: stable@vger.kernel.org # for 6.1 and later Fixes: ae219872834a ("media: mc: entity: Rewrite media_pipeline_start()") Signed-off-by: Sakari Ailus sakari.ailus@linux.intel.com Signed-off-by: Hans Verkuil hverkuil-cisco@xs4all.nl

drivers/media/mc/mc-entity.c | 6 ++++++ 1 file changed, 6 insertions(+)

---

diff --git a/drivers/media/mc/mc-entity.c b/drivers/media/mc/mc-entity.c index 0e28b9a7936e..96dd0f6ccd0d 100644 --- a/drivers/media/mc/mc-entity.c +++ b/drivers/media/mc/mc-entity.c @@ -619,6 +619,12 @@ static int media_pipeline_explore_next_link(struct media_pipeline *pipe, link = list_entry(entry->links, typeof(*link), list); last_link = media_pipeline_walk_pop(walk);

+ if ((link->flags & MEDIA_LNK_FL_LINK_TYPE) != MEDIA_LNK_FL_DATA_LINK) { + dev_dbg(walk->mdev->dev, + "media pipeline: skipping link (not data-link)\n"); + return 0; + } + dev_dbg(walk->mdev->dev, "media pipeline: exploring link '%s':%u -> '%s':%u\n", link->source->entity->name, link->source->index,