This is a note to let you know that I've just added the patch titled gpio: sysfs: Obey valid_mask to the 5.11-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: gpio-sysfs-obey-valid_mask.patch and it can be found in the queue-5.11 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 4770c296ac0361f3f42f7cef6bf7c2d407a7a93d Author: Matti Vaittinen <matti.vaittinen@xxxxxxxxxxxxxxxxx> Date: Mon Mar 29 14:41:12 2021 +0300 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@xxxxxxxxxxxxxxxxx> Reviewed-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx> Signed-off-by: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> 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