From fa86963a7546e08efdb32153522c1a42de069c8b Mon Sep 17 00:00:00 2001 From: Bartosz Golaszewski Date: Mon, 27 Nov 2017 11:48:49 +0100 Subject: [PATCH] gpio: mockup: verify that ngpio > 0 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 Signed-off-by: Linus Walleij --- drivers/gpio/gpio-mockup.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/gpio/gpio-mockup.c b/drivers/gpio/gpio-mockup.c index 68a0c1e06a16..532f5807390b 100644 --- a/drivers/gpio/gpio-mockup.c +++ b/drivers/gpio/gpio-mockup.c @@ -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 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"); -- 2.30.2