diff options
| author | Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com> | 2021-03-29 14:41:12 +0300 |
|---|---|---|
| committer | Bartosz Golaszewski <bgolaszewski@baylibre.com> | 2021-03-31 21:32:38 +0300 |
| commit | 23cf00ddd2e1aacf1873e43f5e0c519c120daf7a (patch) | |
| tree | fb80388d9afee339a82ae0bec0230f724a046a36 /drivers/gpio | |
| parent | 6cb59afe9e5b45a035bd6b97da6593743feefc72 (diff) | |
| download | linux-23cf00ddd2e1aacf1873e43f5e0c519c120daf7a.tar.xz | |
gpio: sysfs: Obey valid_mask
Do not allow exporting GPIOs which are set invalid
by the driver's valid mask.
Fixes: 726cb3ba4969 ("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>
Diffstat (limited to 'drivers/gpio')
| -rw-r--r-- | drivers/gpio/gpiolib-sysfs.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/gpio/gpiolib-sysfs.c b/drivers/gpio/gpiolib-sysfs.c index 26c5466b8179..ae49bb23c6ed 100644 --- a/drivers/gpio/gpiolib-sysfs.c +++ b/drivers/gpio/gpiolib-sysfs.c @@ -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 |