linux-kernel - [PATCH 5.15 110/135] iio: adc: adi-axi-adc: Fix refcount leak in adi_axi_adc_attach

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Message-Id: <20220627111941.346048331@linuxfoundation.org>
Date:   Mon, 27 Jun 2022 13:21:57 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Miaoqian Lin <linmq006@...il.com>,
        Stable@...r.kernel.org,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: [PATCH 5.15 110/135] iio: adc: adi-axi-adc: Fix refcount leak in adi_axi_adc_attach_client

From: Miaoqian Lin <linmq006@...il.com>

commit ada7b0c0dedafd7d059115adf49e48acba3153a8 upstream.

of_parse_phandle() returns a node pointer with refcount
incremented, we should use of_node_put() on it when not need anymore.
Add missing of_node_put() to avoid refcount leak.

Fixes: ef04070692a2 ("iio: adc: adi-axi-adc: add support for AXI ADC IP core")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
Link: https://lore.kernel.org/r/20220524074517.45268-1-linmq006@gmail.com
Cc: <Stable@...r.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/iio/adc/adi-axi-adc.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/iio/adc/adi-axi-adc.c
+++ b/drivers/iio/adc/adi-axi-adc.c
@@ -322,16 +322,19 @@ static struct adi_axi_adc_client *adi_ax
 
 		if (!try_module_get(cl->dev->driver->owner)) {
 			mutex_unlock(&registered_clients_lock);
+			of_node_put(cln);
 			return ERR_PTR(-ENODEV);
 		}
 
 		get_device(cl->dev);
 		cl->info = info;
 		mutex_unlock(&registered_clients_lock);
+		of_node_put(cln);
 		return cl;
 	}
 
 	mutex_unlock(&registered_clients_lock);
+	of_node_put(cln);
 
 	return ERR_PTR(-EPROBE_DEFER);
 }