linux-kernel - [PATCH 1/2] pinctrl: canaan: k230: add NULL check in DT parse

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Message-Id: <20250624-k230-return-check-v1-1-6b4fc5ba0c41@whut.edu.cn>
Date: Tue, 24 Jun 2025 00:11:13 +0800
From: Ze Huang <huangze@...t.edu.cn>
To: Linus Walleij <linus.walleij@...aro.org>, 
 Ze Huang <18771902331@....com>
Cc: linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Ze Huang <huangze@...t.edu.cn>, Yao Zi <ziyao@...root.org>
Subject: [PATCH 1/2] pinctrl: canaan: k230: add NULL check in DT parse

Add a NULL check for the return value of of_get_property() when
retrieving the "pinmux" property in the group parser. This avoids
a potential NULL pointer dereference if the property is missing
from the device tree node.

Also fix a typo ("sintenel") in the device ID match table comment,
correcting it to "sentinel".

Fixes: 545887eab6f6 ("pinctrl: canaan: Add support for k230 SoC")
Reported-by: Yao Zi <ziyao@...root.org>
Signed-off-by: Ze Huang <huangze@...t.edu.cn>
---
 drivers/pinctrl/pinctrl-k230.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/pinctrl/pinctrl-k230.c b/drivers/pinctrl/pinctrl-k230.c
index a9b4627b46b01237801103df566b9391f8be21b8..4976308e62372c744738dd8372e73b2494e38e0b 100644
--- a/drivers/pinctrl/pinctrl-k230.c
+++ b/drivers/pinctrl/pinctrl-k230.c
@@ -477,6 +477,10 @@ static int k230_pinctrl_parse_groups(struct device_node *np,
 	grp->name = np->name;
 
 	list = of_get_property(np, "pinmux", &size);
+	if (!list) {
+		dev_err(dev, "failed to get pinmux property\n");
+		return -EINVAL;
+	}
 	size /= sizeof(*list);
 
 	grp->num_pins = size;
@@ -623,7 +627,7 @@ static int k230_pinctrl_probe(struct platform_device *pdev)
 
 static const struct of_device_id k230_dt_ids[] = {
 	{ .compatible = "canaan,k230-pinctrl", },
-	{ /* sintenel */ }
+	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, k230_dt_ids);
 

-- 
2.50.0