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gpio fixes for v5.12-rc8

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- do not allow exporting GPIO lines which were marked invalid by the driver
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Merge tag 'gpio-fixes-for-v5.12-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux

Pull gpio fix from Bartosz Golaszewski:
 "A single fix for an older problem with the sysfs interface: do not
  allow exporting GPIO lines which were marked invalid by the driver"

* tag 'gpio-fixes-for-v5.12-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux:
  gpio: sysfs: Obey valid_mask
This commit is contained in:
Linus Torvalds 2021-04-15 10:48:51 -07:00
commit 33f0d9d94a
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