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gpio: sysfs: Obey valid_mask

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Do not allow exporting GPIOs which are set invalid
by the driver's valid mask.

Fixes: 726cb3ba49 ("gpiolib: Support 'gpio-reserved-ranges' property")
Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
This commit is contained in:
Matti Vaittinen 2021-03-29 14:41:12 +03:00 committed by Bartosz Golaszewski
parent 6cb59afe9e
commit 23cf00ddd2
1 changed files with 8 additions and 0 deletions
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8
drivers/gpio/gpiolib-sysfs.c
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@ -458,6 +458,8 @@ static ssize_t export_store(struct class *class,
long gpio;
struct gpio_desc *desc;
int status;
struct gpio_chip *gc;
int offset;
status = kstrtol(buf, 0, &gpio);
if (status < 0)
@ -469,6 +471,12 @@ static ssize_t export_store(struct class *class,
pr_warn("%s: invalid GPIO %ld\n", __func__, gpio);
return -EINVAL;
}
gc = desc->gdev->chip;
offset = gpio_chip_hwgpio(desc);
if (!gpiochip_line_is_valid(gc, offset)) {
pr_warn("%s: GPIO %ld masked\n", __func__, gpio);
return -EINVAL;
}
/* No extra locking here; FLAG_SYSFS just signifies that the
* request and export were done by on behalf of userspace, so