linux-kernel - [PATCH 3/3] pinctrl: at91-pio4: check return value of devm

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Message-ID: <20230615105333.585304-4-claudiu.beznea@microchip.com>
Date:   Thu, 15 Jun 2023 13:53:33 +0300
From:   Claudiu Beznea <claudiu.beznea@...rochip.com>
To:     <ludovic.desroches@...rochip.com>, <linus.walleij@...aro.org>,
        <nicolas.ferre@...rochip.com>, <alexandre.belloni@...tlin.com>,
        <lars.povlsen@...rochip.com>, <Steen.Hegelund@...rochip.com>,
        <daniel.machon@...rochip.com>, <UNGLinuxDriver@...rochip.com>,
        <andriy.shevchenko@...ux.intel.com>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-gpio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>
Subject: [PATCH 3/3] pinctrl: at91-pio4: check return value of devm_kasprintf()

devm_kasprintf() returns a pointer to dynamically allocated memory.
Pointer could be NULL in case allocation fails. Check pointer validity.
Identified with coccinelle (kmerr.cocci script).

Fixes: 776180848b57 ("pinctrl: introduce driver for Atmel PIO4 controller")
Depends-on: 1c4e5c470a56 ("pinctrl: at91: use devm_kasprintf() to avoid potential leaks")
Depends-on: 5a8f9cf269e8 ("pinctrl: at91-pio4: use proper format specifier for unsigned int")
Signed-off-by: Claudiu Beznea <claudiu.beznea@...rochip.com>
---
 drivers/pinctrl/pinctrl-at91-pio4.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/pinctrl/pinctrl-at91-pio4.c b/drivers/pinctrl/pinctrl-at91-pio4.c
index e40487be2038..fc7d7155bb8d 100644
--- a/drivers/pinctrl/pinctrl-at91-pio4.c
+++ b/drivers/pinctrl/pinctrl-at91-pio4.c
@@ -1146,6 +1146,8 @@ static int atmel_pinctrl_probe(struct platform_device *pdev)
 		/* Pin naming convention: P(bank_name)(bank_pin_number). */
 		pin_desc[i].name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "P%c%u",
 						  bank + 'A', line);
+		if (!pin_desc[i].name)
+			return -ENOMEM;
 
 		group->name = group_names[i] = pin_desc[i].name;
 		group->pin = pin_desc[i].number;
-- 
2.34.1