linux-kernel - [PATCH 1/2] pinctrl: intel: platform: fix error path in device_for_each_child

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Message-Id: <20240926-intel-pinctrl-platform-scoped-v1-1-5ee4c936eea3@gmail.com>
Date: Thu, 26 Sep 2024 16:11:02 +0200
From: Javier Carrasco <javier.carrasco.cruz@...il.com>
To: Mika Westerberg <mika.westerberg@...ux.intel.com>, 
 Andy Shevchenko <andy@...nel.org>, Linus Walleij <linus.walleij@...aro.org>
Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>, 
 linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Javier Carrasco <javier.carrasco.cruz@...il.com>, stable@...r.kernel.org
Subject: [PATCH 1/2] pinctrl: intel: platform: fix error path in
 device_for_each_child_node()

The device_for_each_child_node() loop requires calls to
fwnode_handle_put() upon early returns to decrement the refcount of
the child node and avoid leaking memory if that error path is triggered.

There is one early returns within that loop in
intel_platform_pinctrl_prepare_community(), but fwnode_handle_put() is
missing.

Instead of adding the missing call, the scoped version of the loop can
be used to simplify the code and avoid mistakes in the future if new
early returns are added, as the child node is only used for parsing, and
it is never assigned.

Cc: stable@...r.kernel.org
Fixes: c5860e4a2737 ("pinctrl: intel: Add a generic Intel pin control platform driver")
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@...il.com>
---
 drivers/pinctrl/intel/pinctrl-intel-platform.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/pinctrl/intel/pinctrl-intel-platform.c b/drivers/pinctrl/intel/pinctrl-intel-platform.c
index 4a19ab3b4ba7..2d5ba8278fb9 100644
--- a/drivers/pinctrl/intel/pinctrl-intel-platform.c
+++ b/drivers/pinctrl/intel/pinctrl-intel-platform.c
@@ -90,7 +90,6 @@ static int intel_platform_pinctrl_prepare_community(struct device *dev,
 						    struct intel_community *community,
 						    struct intel_platform_pins *pins)
 {
-	struct fwnode_handle *child;
 	struct intel_padgroup *gpps;
 	unsigned int group;
 	size_t ngpps;
@@ -131,7 +130,7 @@ static int intel_platform_pinctrl_prepare_community(struct device *dev,
 		return -ENOMEM;
 
 	group = 0;
-	device_for_each_child_node(dev, child) {
+	device_for_each_child_node_scoped(dev, child) {
 		struct intel_padgroup *gpp = &gpps[group];
 
 		gpp->reg_num = group;

-- 
2.43.0