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

Ben Hutchings
2020-02-08T18:39:32Z

From: Krzysztof Kozlowski <krzk@kernel.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@kernel.org>
[bwh: Backported to 3.16: adjust filename, context]
Signed-off-by: Ben Hutchings <ben@decadent.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) {