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gpiolib: sanitize the return value of gpio_chip::get_multiple()

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As per the API contract, the get_multiple() callback is only allowed to
return 0 or a negative error number. Filter out anything else.

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20250210-gpio-sanitize-retvals-v1-5-12ea88506cb2@linaro.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
This commit is contained in:
Bartosz Golaszewski 2025-02-10 11:51:59 +01:00
parent 86ef402d80
commit 74abd086d2
1 changed files with 8 additions and 2 deletions
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10
drivers/gpio/gpiolib.c
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@ -3182,10 +3182,16 @@ static int gpiod_get_raw_value_commit(const struct gpio_desc *desc)
static int gpio_chip_get_multiple(struct gpio_chip *gc,
unsigned long *mask, unsigned long *bits)
{
int ret;
lockdep_assert_held(&gc->gpiodev->srcu);
if (gc->get_multiple)
return gc->get_multiple(gc, mask, bits);
if (gc->get_multiple) {
ret = gc->get_multiple(gc, mask, bits);
if (ret > 0)
return -EBADE;
}
if (gc->get) {
int i, value;