linux-kernel - [PATCH] drm/kmb: fix potential memleak in error branch

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Date:   Wed, 17 Nov 2021 18:37:23 -0800
From:   Bernard Zhao <bernard@...o.com>
To:     Anitha Chrisanthus <anitha.chrisanthus@...el.com>,
        Edmund Dea <edmund.j.dea@...el.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Cc:     Bernard Zhao <bernard@...o.com>
Subject: [PATCH] drm/kmb: fix potential memleak in error branch

This patch try to fix coccicheck warning:
./drivers/gpu/drm/kmb/kmb_drv.c:519:2-8: ERROR: missing put_device; call of_find_device_by_node on line 506, but without a corresponding object release within this function.
./drivers/gpu/drm/kmb/kmb_drv.c:522:2-8: ERROR: missing put_device; call of_find_device_by_node on line 506, but without a corresponding object release within this function.
./drivers/gpu/drm/kmb/kmb_drv.c:529:2-8: ERROR: missing put_device; call of_find_device_by_node on line 506, but without a corresponding object release within this function.
./drivers/gpu/drm/kmb/kmb_drv.c:579:1-7: ERROR: missing put_device; call of_find_device_by_node on line 506, but without a corresponding object release within this function.

Signed-off-by: Bernard Zhao <bernard@...o.com>
---
 drivers/gpu/drm/kmb/kmb_drv.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/kmb/kmb_drv.c b/drivers/gpu/drm/kmb/kmb_drv.c
index 961ac6fb5fcf..4a7178288ecf 100644
--- a/drivers/gpu/drm/kmb/kmb_drv.c
+++ b/drivers/gpu/drm/kmb/kmb_drv.c
@@ -514,8 +514,10 @@ static int kmb_probe(struct platform_device *pdev)
 	ret = kmb_dsi_host_bridge_init(get_device(&dsi_pdev->dev));

 	if (ret == -EPROBE_DEFER) {
+		of_dev_put(dsi_pdev);
 		return -EPROBE_DEFER;
 	} else if (ret) {
+		of_dev_put(dsi_pdev);
 		DRM_ERROR("probe failed to initialize DSI host bridge\n");
 		return ret;
 	}
@@ -523,8 +525,10 @@ static int kmb_probe(struct platform_device *pdev)
 	/* Create DRM device */
 	kmb = devm_drm_dev_alloc(dev, &kmb_driver,
 				 struct kmb_drm_private, drm);
-	if (IS_ERR(kmb))
+	if (IS_ERR(kmb)) {
+		of_dev_put(dsi_pdev);
 		return PTR_ERR(kmb);
+	}

 	dev_set_drvdata(dev, &kmb->drm);

@@ -572,6 +576,8 @@ static int kmb_probe(struct platform_device *pdev)
 	dev_set_drvdata(dev, NULL);
 	kmb_dsi_host_unregister(kmb->kmb_dsi);

+	of_dev_put(dsi_pdev);
+
 	return ret;
 }

-- 
2.33.1