linux-kernel - [PATCH v4 4/6] media: v4l: async: Fix duplicated list deletion

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Message-ID: <20231113230421.226808-5-sre@kernel.org>
Date:   Mon, 13 Nov 2023 23:57:23 +0100
From:   Sebastian Reichel <sre@...nel.org>
To:     Sebastian Reichel <sre@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Jacopo Mondi <jacopo.mondi@...asonboard.com>
Cc:     Alain Volmat <alain.volmat@...s.st.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v4 4/6] media: v4l: async: Fix duplicated list deletion

The list deletion call dropped here is already called from the
helper function in the line before. Having a second list_del()
call results in either a warning (with CONFIG_DEBUG_LIST=y):

list_del corruption, c46c8198->next is LIST_POISON1 (00000100)

If CONFIG_DEBUG_LIST is disabled the operation results in a
kernel error due to NULL pointer dereference.

Fixes: 28a1295795d8 ("media: v4l: async: Allow multiple connections between entities")
Signed-off-by: Sebastian Reichel <sre@...nel.org>
---
 drivers/media/v4l2-core/v4l2-async.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/media/v4l2-core/v4l2-async.c b/drivers/media/v4l2-core/v4l2-async.c
index 091e8cf4114b..8cfd593d293d 100644
--- a/drivers/media/v4l2-core/v4l2-async.c
+++ b/drivers/media/v4l2-core/v4l2-async.c
@@ -880,7 +880,6 @@ void v4l2_async_unregister_subdev(struct v4l2_subdev *sd)
 				  &asc->notifier->waiting_list);
 
 			v4l2_async_unbind_subdev_one(asc->notifier, asc);
-			list_del(&asc->asc_subdev_entry);
 		}
 	}
 
-- 
2.42.0