linux-kernel - [PATCH] media: mc: Fix graph walk in media_pipeline

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Message-Id: <20240315-mc-graph-fix-v1-1-91d59d752614@ideasonboard.com>
Date: Fri, 15 Mar 2024 17:12:34 +0200
From: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
To: Sakari Ailus <sakari.ailus@...ux.intel.com>, 
 Laurent Pinchart <laurent.pinchart@...asonboard.com>, 
 Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Subject: [PATCH] media: mc: Fix graph walk in media_pipeline_start

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@...asonboard.com>
Fixes: ae219872834a ("media: mc: entity: Rewrite media_pipeline_start()")
---
 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 543a392f8635..fcafe5c59052 100644
--- a/drivers/media/mc/mc-entity.c
+++ b/drivers/media/mc/mc-entity.c
@@ -627,6 +627,12 @@ static int media_pipeline_explore_next_link(struct media_pipeline *pipe,
 		return 0;
 	}
 
+	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;
+	}
+
 	/* Get the local pad and remote pad. */
 	if (link->source->entity == pad->entity) {
 		local = link->source;

---
base-commit: e8f897f4afef0031fe618a8e94127a0934896aba
change-id: 20240315-mc-graph-fix-8a2a245d7346

Best regards,
-- 
Tomi Valkeinen <tomi.valkeinen@...asonboard.com>