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authorBartosz Golaszewski <brgl@bgdev.pl>2017-11-27 13:48:49 +0300
committerLinus Walleij <linus.walleij@linaro.org>2017-12-03 00:42:28 +0300
commitfa86963a7546e08efdb32153522c1a42de069c8b (patch)
tree406ed558fb99f99a7449b5f8a5ad43985410ff14 /drivers/gpio/gpio-mockup.c
parent46526c15cadcba43c69e22a6dfaf3f6f444c70aa (diff)
downloadlinux-fa86963a7546e08efdb32153522c1a42de069c8b.tar.xz
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 <brgl@bgdev.pl> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio/gpio-mockup.c')
-rw-r--r--drivers/gpio/gpio-mockup.c9
1 files changed, 9 insertions, 0 deletions
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 <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");