From: Andy Shevchenko Date: Thu, 8 May 2025 20:08:07 +0000 (+0300) Subject: pinctrl: at91: Fix possible out-of-boundary access X-Git-Tag: v6.16-rc1~113^2~9 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=762ef7d1e6eefad9896560bfcb9bcf7f1b6df9c1;p=thirdparty%2Flinux.git pinctrl: at91: Fix possible out-of-boundary access at91_gpio_probe() doesn't check that given OF alias is not available or something went wrong when trying to get it. This might have consequences when accessing gpio_chips array with that value as an index. Note, that BUG() can be compiled out and hence won't actually perform the required checks. Fixes: 6732ae5cb47c ("ARM: at91: add pinctrl support") Signed-off-by: Andy Shevchenko Closes: https://lore.kernel.org/r/202505052343.UHF1Zo93-lkp@intel.com/ Link: https://lore.kernel.org/20250508200807.1384558-1-andriy.shevchenko@linux.intel.com Signed-off-by: Linus Walleij --- diff --git a/drivers/pinctrl/pinctrl-at91.c b/drivers/pinctrl/pinctrl-at91.c index 442dd8c80b650..6c2727bd55bc3 100644 --- a/drivers/pinctrl/pinctrl-at91.c +++ b/drivers/pinctrl/pinctrl-at91.c @@ -1822,12 +1822,16 @@ static int at91_gpio_probe(struct platform_device *pdev) struct at91_gpio_chip *at91_chip = NULL; struct gpio_chip *chip; struct pinctrl_gpio_range *range; + int alias_idx; int ret = 0; int irq, i; - int alias_idx = of_alias_get_id(np, "gpio"); uint32_t ngpio; char **names; + alias_idx = of_alias_get_id(np, "gpio"); + if (alias_idx < 0) + return alias_idx; + BUG_ON(alias_idx >= ARRAY_SIZE(gpio_chips)); if (gpio_chips[alias_idx]) return dev_err_probe(dev, -EBUSY, "%d slot is occupied.\n", alias_idx);