linux-kernel - [PATCH v2] pinctrl: mcp23s08: check return value of devm

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Message-ID: <20230621100409.1608395-1-claudiu.beznea@microchip.com>
Date:   Wed, 21 Jun 2023 13:04:09 +0300
From:   Claudiu Beznea <claudiu.beznea@...rochip.com>
To:     <linus.walleij@...aro.org>, <andriy.shevchenko@...ux.intel.com>
CC:     <linux-gpio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        "Claudiu Beznea" <claudiu.beznea@...rochip.com>
Subject: [PATCH v2] 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>
---

Changes in v2:
- use independent checks for devm_kasprintf()

 drivers/pinctrl/pinctrl-mcp23s08_spi.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/pinctrl/pinctrl-mcp23s08_spi.c b/drivers/pinctrl/pinctrl-mcp23s08_spi.c
index 9ae10318f6f3..ea059b9c5542 100644
--- a/drivers/pinctrl/pinctrl-mcp23s08_spi.c
+++ b/drivers/pinctrl/pinctrl-mcp23s08_spi.c
@@ -91,18 +91,28 @@ static int mcp23s08_spi_regmap_init(struct mcp23s08 *mcp, struct device *dev,
 		mcp->reg_shift = 0;
 		mcp->chip.ngpio = 8;
 		mcp->chip.label = devm_kasprintf(dev, GFP_KERNEL, "mcp23s08.%d", addr);
+		if (!mcp->chip.label)
+			return -ENOMEM;
 
 		config = &mcp23x08_regmap;
 		name = devm_kasprintf(dev, GFP_KERNEL, "%d", addr);
+		if (!name)
+			return -ENOMEM;
+
 		break;
 
 	case MCP_TYPE_S17:
 		mcp->reg_shift = 1;
 		mcp->chip.ngpio = 16;
 		mcp->chip.label = devm_kasprintf(dev, GFP_KERNEL, "mcp23s17.%d", addr);
+		if (!mcp->chip.label)
+			return -ENOMEM;
 
 		config = &mcp23x17_regmap;
 		name = devm_kasprintf(dev, GFP_KERNEL, "%d", addr);
+		if (!name)
+			return -ENOMEM;
+
 		break;
 
 	case MCP_TYPE_S18:
-- 
2.34.1