linux-kernel - [PATCH] pinctrl: devicetree: fix refcount leak in pinctrl_dt_to

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Date: Mon, 15 Apr 2024 18:53:28 +0800
From: Zeng Heng <zengheng4@...wei.com>
To: <linus.walleij@...aro.org>
CC: <linux-kernel@...r.kernel.org>, <xiexiuqi@...wei.com>,
	<linux-gpio@...r.kernel.org>, <weiyongjun1@...wei.com>,
	<dan.carpenter@...aro.org>, <liwei391@...wei.com>
Subject: [PATCH] pinctrl: devicetree: fix refcount leak in pinctrl_dt_to_map()

If we fail to allocate propname buffer, we need to drop the reference
count we just took. Because the pinctrl_dt_free_maps() includes the
droping operation, here we call it directly.

Fixes: 91d5c5060ee2 ("pinctrl: devicetree: fix null pointer dereferencing in pinctrl_dt_to_map")
Suggested-by: Dan Carpenter <dan.carpenter@...aro.org>
Signed-off-by: Zeng Heng <zengheng4@...wei.com>
---
 drivers/pinctrl/devicetree.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/pinctrl/devicetree.c b/drivers/pinctrl/devicetree.c
index df1efc2e5202..6a94ecd6a8de 100644
--- a/drivers/pinctrl/devicetree.c
+++ b/drivers/pinctrl/devicetree.c
@@ -220,14 +220,16 @@ int pinctrl_dt_to_map(struct pinctrl *p, struct pinctrl_dev *pctldev)
 	for (state = 0; ; state++) {
 		/* Retrieve the pinctrl-* property */
 		propname = kasprintf(GFP_KERNEL, "pinctrl-%d", state);
-		if (!propname)
-			return -ENOMEM;
+		if (!propname) {
+			ret = -ENOMEM;
+			goto err;
+		}
 		prop = of_find_property(np, propname, &size);
 		kfree(propname);
 		if (!prop) {
 			if (state == 0) {
-				of_node_put(np);
-				return -ENODEV;
+				ret = -ENODEV;
+				goto err;
 			}
 			break;
 		}
-- 
2.25.1