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pinctrl: at91: Fix possible out-of-boundary access

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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: 6732ae5cb4 ("ARM: at91: add pinctrl support")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
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 <linus.walleij@linaro.org>
This commit is contained in:
Andy Shevchenko 2025-05-08 23:08:07 +03:00 • committed by Linus Walleij
parent 3b38cce83f
commit 762ef7d1e6
1 changed files with 5 additions and 1 deletions
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6
drivers/pinctrl/pinctrl-at91.c
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@ -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);