diff --git a/drivers/gpio/gpiolib-sysfs.c b/drivers/gpio/gpiolib-sysfs.c index 3dbaf489a8a5..e0ccc79b239a 100644 --- a/drivers/gpio/gpiolib-sysfs.c +++ b/drivers/gpio/gpiolib-sysfs.c @@ -462,6 +462,8 @@ 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) @@ -473,6 +475,12 @@ 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