linux-kernel - [PATCH 3.16 012/148] pinctrl: samsung: Fix device node refcount leaks in S3C64xx wakeup controller init

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Message-ID: <lsq.1581185940.956414429@decadent.org.uk>
Date:   Sat, 08 Feb 2020 18:19:11 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Krzysztof Kozlowski" <krzk@...nel.org>
Subject: [PATCH 3.16 012/148] pinctrl: samsung: Fix device node refcount
 leaks in S3C64xx wakeup controller init

3.16.82-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Krzysztof Kozlowski <krzk@...nel.org>

commit 7f028caadf6c37580d0f59c6c094ed09afc04062 upstream.

In s3c64xx_eint_eint0_init() the for_each_child_of_node() loop is used
with a break to find a matching child node.  Although each iteration of
for_each_child_of_node puts the previous node, but early exit from loop
misses it.  This leads to leak of device node.

Fixes: 61dd72613177 ("pinctrl: Add pinctrl-s3c64xx driver")
Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>
[bwh: Backported to 3.16: adjust filename, context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
--- a/drivers/pinctrl/pinctrl-s3c64xx.c
+++ b/drivers/pinctrl/pinctrl-s3c64xx.c
@@ -718,6 +718,7 @@ static int s3c64xx_eint_eint0_init(struc
 	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
 	if (!data) {
 		dev_err(dev, "could not allocate memory for wkup eint data\n");
+		of_node_put(eint0_np);
 		return -ENOMEM;
 	}
 	data->drvdata = d;
@@ -728,12 +729,14 @@ static int s3c64xx_eint_eint0_init(struc
 		irq = irq_of_parse_and_map(eint0_np, i);
 		if (!irq) {
 			dev_err(dev, "failed to get wakeup EINT IRQ %d\n", i);
+			of_node_put(eint0_np);
 			return -ENXIO;
 		}
 
 		irq_set_chained_handler(irq, s3c64xx_eint0_handlers[i]);
 		irq_set_handler_data(irq, data);
 	}
+	of_node_put(eint0_np);
 
 	bank = d->ctrl->pin_banks;
 	for (i = 0; i < d->ctrl->nr_banks; ++i, ++bank) {