diff options
| author | Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com> | 2021-03-29 14:41:12 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-04-21 12:56:13 +0200 |
| commit | 5130cda3cb1fcc5f4e5c08ff3fba87171c5b3c80 (patch) | |
| tree | 2eacfb9b9cc7a3fad77368555d9a5ce98b59aeb7 /drivers/gpio | |
| parent | 2dce5702ef054c118a13fdf36e8e145838036b99 (diff) | |
gpio: sysfs: Obey valid_mask
[ Upstream commit 23cf00ddd2e1aacf1873e43f5e0c519c120daf7a ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
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 fbf6b1a0a4fa..558cd900d399 100644 --- a/drivers/gpio/gpiolib-sysfs.c +++ b/drivers/gpio/gpiolib-sysfs.c @@ -457,6 +457,8 @@ 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) @@ -468,6 +470,12 @@ 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 |