linux-kernel - [PATCH] leds: mt6360: fix memory leak in mt6360_init_isnk

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Date: Tue, 11 Jun 2024 00:40:26 +0200
From: Javier Carrasco <javier.carrasco.cruz@...il.com>
To: Pavel Machek <pavel@....cz>, Lee Jones <lee@...nel.org>, 
 Matthias Brugger <matthias.bgg@...il.com>, 
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org, 
 stable@...r.kernel.org, Javier Carrasco <javier.carrasco.cruz@...il.com>
Subject: [PATCH] leds: mt6360: fix memory leak in
 mt6360_init_isnk_properties()

The fwnode_for_each_child_node() loop requires manual intervention to
decrement the child refcount in case of an early return.

Add the missing calls to fwnode_handle_put(child) to avoid memory leaks
in the error paths.

Cc: stable@...r.kernel.org
Fixes: 679f8652064b ("leds: Add mt6360 driver")
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@...il.com>
---
This bug was found while analyzing the code and I have no real hardware
to validate the fix beyond compilation and static analysis. But given
that the child node is only used to retrieve some properties within the
fwnode_for_each_child_node(), and it is not used outside the loop, the
fix is straightforward.

Nevertheless, any tests to catch regressions with real hardware are
always welcome.

The bug has been around since the driver was added.
---
 drivers/leds/flash/leds-mt6360.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/leds/flash/leds-mt6360.c b/drivers/leds/flash/leds-mt6360.c
index 1b75b4d36834..4c74f1cf01f0 100644
--- a/drivers/leds/flash/leds-mt6360.c
+++ b/drivers/leds/flash/leds-mt6360.c
@@ -643,14 +643,17 @@ static int mt6360_init_isnk_properties(struct mt6360_led *led,
 
 			ret = fwnode_property_read_u32(child, "reg", &reg);
 			if (ret || reg > MT6360_LED_ISNK3 ||
-			    priv->leds_active & BIT(reg))
+			    priv->leds_active & BIT(reg)) {
+				fwnode_handle_put(child);
 				return -EINVAL;
+			}
 
 			ret = fwnode_property_read_u32(child, "color", &color);
 			if (ret) {
 				dev_err(priv->dev,
 					"led %d, no color specified\n",
 					led->led_no);
+				fwnode_handle_put(child);
 				return ret;
 			}
 

---
base-commit: d35b2284e966c0bef3e2182a5c5ea02177dd32e4
change-id: 20240610-leds-mt6360-memleak-78faf3e435b0

Best regards,
-- 
Javier Carrasco <javier.carrasco.cruz@...il.com>