linux-kernel - [PATCH 1/3] pinctrl: mcp23s08: check return value of devm

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Message-ID: <20230615105333.585304-2-claudiu.beznea@microchip.com>
Date:   Thu, 15 Jun 2023 13:53:31 +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 1/3] pinctrl: mcp23s08: 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: 0f04a81784fe ("pinctrl: mcp23s08: Split to three parts: core, I²C, SPI")
Signed-off-by: Claudiu Beznea <claudiu.beznea@...rochip.com>
---
 drivers/pinctrl/pinctrl-mcp23s08_spi.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/pinctrl/pinctrl-mcp23s08_spi.c b/drivers/pinctrl/pinctrl-mcp23s08_spi.c
index 9ae10318f6f3..4013ffbfa282 100644
--- a/drivers/pinctrl/pinctrl-mcp23s08_spi.c
+++ b/drivers/pinctrl/pinctrl-mcp23s08_spi.c
@@ -119,6 +119,9 @@ static int mcp23s08_spi_regmap_init(struct mcp23s08 *mcp, struct device *dev,
 		return -EINVAL;
 	}
 
+	if (!name || !mcp->chip.label)
+		return -ENOMEM;
+
 	copy = devm_kmemdup(dev, config, sizeof(*config), GFP_KERNEL);
 	if (!copy)
 		return -ENOMEM;
-- 
2.34.1