pinctrl: at91-pio4: check return value of devm_kasprintf()

[ Upstream commit f6fd5d4ff8ca0b24cee1af4130bcb1fa96b61aa0 ]

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@microchip.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20230615105333.585304-4-claudiu.beznea@microchip.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/pinctrl/pinctrl-at91-pio4.c b/drivers/pinctrl/pinctrl-at91-pio4.c
index 0b7cc6f..f71c645 100644 (file)
--- a/drivers/pinctrl/pinctrl-at91-pio4.c
+++ b/drivers/pinctrl/pinctrl-at91-pio4.c
@@ -1122,6 +1122,8 @@ 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%d",
                                                  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;