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gpio: mockup: verify that ngpio > 0

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Improve the module params sanitization: bail out from init if the user
tries to pass a non-positive number of GPIO lines for any mockup chip.

Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Bartosz Golaszewski 2017-11-27 11:48:49 +01:00 committed by Linus Walleij
parent 46526c15ca
commit fa86963a75
1 changed files with 9 additions and 0 deletions
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9
drivers/gpio/gpio-mockup.c
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@ -335,6 +335,15 @@ static int __init gpio_mockup_init(void)
/* Each chip is described by two values. */
num_chips = gpio_mockup_params_nr / 2;
/*
* The second value in the <base GPIO - number of GPIOS> pair must
* always be greater than 0.
*/
for (i = 0; i < num_chips; i++) {
if (gpio_mockup_ranges[i * 2 + 1] < 0)
return -EINVAL;
}
gpio_mockup_dbg_dir = debugfs_create_dir("gpio-mockup-event", NULL);
if (IS_ERR_OR_NULL(gpio_mockup_dbg_dir))
gpio_mockup_err("error creating debugfs directory\n");