linux-kernel - [PATCH] pinctrl: apple-gpio: Fix null pointer dereference in apple_gpio_pinctrl

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Date: Tue,  9 Apr 2024 19:02:54 +0800
From: Ma Ke <make_ruc2021@....com>
To: marcan@...can.st,
	sven@...npeter.dev,
	alyssa@...enzweig.io,
	linus.walleij@...aro.org
Cc: asahi@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org,
	linux-gpio@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Ma Ke <make_ruc2021@....com>
Subject: [PATCH] pinctrl: apple-gpio: Fix null pointer dereference in apple_gpio_pinctrl_probe()

devm_kasprintf() returns a pointer to dynamically allocated memory which
can be NULL upon failure. We add a check to ensure that failure does not
occur.

Signed-off-by: Ma Ke <make_ruc2021@....com>
---
 drivers/pinctrl/pinctrl-apple-gpio.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/pinctrl/pinctrl-apple-gpio.c b/drivers/pinctrl/pinctrl-apple-gpio.c
index 3751c7de37aa..af2f90d1950f 100644
--- a/drivers/pinctrl/pinctrl-apple-gpio.c
+++ b/drivers/pinctrl/pinctrl-apple-gpio.c
@@ -474,6 +474,8 @@ static int apple_gpio_pinctrl_probe(struct platform_device *pdev)
 	for (i = 0; i < npins; i++) {
 		pins[i].number = i;
 		pins[i].name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "PIN%u", i);
+		if (!pins[i].name)
+			return -ENOMEM;
 		pins[i].drv_data = pctl;
 		pin_names[i] = pins[i].name;
 		pin_nums[i] = i;
-- 
2.37.2