linux-kernel - [PATCH 1/2] soc: amlogic: canvas: fix device leak on lookup

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Message-ID: <20250926142454.5929-2-johan@kernel.org>
Date: Fri, 26 Sep 2025 16:24:53 +0200
From: Johan Hovold <johan@...nel.org>
To: Neil Armstrong <neil.armstrong@...aro.org>,
	Kevin Hilman <khilman@...libre.com>
Cc: Jerome Brunet <jbrunet@...libre.com>,
	Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
	linux-amlogic@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Johan Hovold <johan@...nel.org>,
	stable@...r.kernel.org,
	Yu Kuai <yukuai3@...wei.com>
Subject: [PATCH 1/2] soc: amlogic: canvas: fix device leak on lookup

Make sure to drop the reference taken to the canvas platform device when
looking up its driver data.

Note that holding a reference to a device does not prevent its driver
data from going away so there is no point in keeping the reference.

Also note that commit 28f851e6afa8 ("soc: amlogic: canvas: add missing
put_device() call in meson_canvas_get()") fixed the leak in a lookup
error path, but the reference is still leaking on success.

Fixes: d4983983d987 ("soc: amlogic: add meson-canvas driver")
Cc: stable@...r.kernel.org	# 4.20: 28f851e6afa8
Cc: Yu Kuai <yukuai3@...wei.com>
Signed-off-by: Johan Hovold <johan@...nel.org>
---
 drivers/soc/amlogic/meson-canvas.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/soc/amlogic/meson-canvas.c b/drivers/soc/amlogic/meson-canvas.c
index b6e06c4d2117..0711088da5dc 100644
--- a/drivers/soc/amlogic/meson-canvas.c
+++ b/drivers/soc/amlogic/meson-canvas.c
@@ -73,10 +73,9 @@ struct meson_canvas *meson_canvas_get(struct device *dev)
 	 * current state, this driver probe cannot return -EPROBE_DEFER
 	 */
 	canvas = dev_get_drvdata(&canvas_pdev->dev);
-	if (!canvas) {
-		put_device(&canvas_pdev->dev);
+	put_device(&canvas_pdev->dev);
+	if (!canvas)
 		return ERR_PTR(-EINVAL);
-	}
 
 	return canvas;
 }
-- 
2.49.1