linux-kernel - [PATCH v2] media: pci: intel: ivsc: fix error handling in mei

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Message-Id: <20250922094335.28486-1-make24@iscas.ac.cn>
Date: Mon, 22 Sep 2025 17:43:35 +0800
From: Ma Ke <make24@...as.ac.cn>
To: sakari.ailus@...ux.intel.com,
	bingbu.cao@...el.com,
	lixu.zhang@...el.com,
	stanislaw.gruszka@...ux.intel.com,
	mchehab@...nel.org,
	wentong.wu@...el.com
Cc: linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org,
	Ma Ke <make24@...as.ac.cn>,
	stable@...r.kernel.org
Subject: [PATCH v2] media: pci: intel: ivsc: fix error handling in mei_ace driver

The mei_ace driver contains a device reference count leak in
mei_ace_setup_dev_link() where device_find_child_by_name() increases
the reference count of the found device but this reference is not
properly decreased in the success path. Add put_device() in
mei_ace_setup_dev_link() and delete put_device() in mei_ace_remove(),
which ensures that the reference count of the device is correctly
managed regardless of whether the probe is successful or fails.

Found by code review.

Cc: stable@...r.kernel.org
Fixes: 78876f71b3e9 ("media: pci: intel: ivsc: Add ACE submodule")
Signed-off-by: Ma Ke <make24@...as.ac.cn>
---
Changes in v2:
- modified the put_device() operations and the patch title as suggestions.
---
 drivers/media/pci/intel/ivsc/mei_ace.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/pci/intel/ivsc/mei_ace.c b/drivers/media/pci/intel/ivsc/mei_ace.c
index 98310b8511b1..bb57656fc85a 100644
--- a/drivers/media/pci/intel/ivsc/mei_ace.c
+++ b/drivers/media/pci/intel/ivsc/mei_ace.c
@@ -420,6 +420,7 @@ static int mei_ace_setup_dev_link(struct mei_ace *ace)
 		goto err_put;
 	}
 
+	put_device(csi_dev);
 	ace->csi_dev = csi_dev;
 
 	return 0;
@@ -522,7 +523,6 @@ static void mei_ace_remove(struct mei_cl_device *cldev)
 	cancel_work_sync(&ace->work);
 
 	device_link_del(ace->csi_link);
-	put_device(ace->csi_dev);
 
 	pm_runtime_disable(&cldev->dev);
 	pm_runtime_set_suspended(&cldev->dev);
-- 
2.17.1