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| author | Linus Walleij <linus.walleij@linaro.org> | 2016-06-16 11:55:55 +0200 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2016-06-17 18:12:19 +0200 |
| commit | bfbbe44daf64d0ccf2de123179817f3557fb9237 (patch) | |
| tree | 051573607cf58ae0f743f2dc6b96ee3f308de840 | |
| parent | 79bb71bd1d93197ce227fa167b450b633f30a52b (diff) | |
| download | linux-bfbbe44daf64d0ccf2de123179817f3557fb9237.tar.gz linux-bfbbe44daf64d0ccf2de123179817f3557fb9237.tar.bz2 linux-bfbbe44daf64d0ccf2de123179817f3557fb9237.zip | |
gpio: make library immune to error pointers
Most functions that take a GPIO descriptor in need to check the
descriptor for IS_ERR(). We do this mostly in the VALIDATE_DESC()
macro except for the gpiod_to_irq() function which needs special
handling.
Cc: stable@vger.kernel.org
Reported-by: Grygorii Strashko <grygorii.strashko@ti.com>
Reviewed-by: Grygorii Strashko <grygorii.strashko@ti.com>
Acked-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| -rw-r--r-- | drivers/gpio/gpiolib.c | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index f39bf05993e7..570771ed19e6 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -1373,8 +1373,12 @@ done: #define VALIDATE_DESC(desc) do { \ if (!desc) \ return 0; \ + if (IS_ERR(desc)) { \ + pr_warn("%s: invalid GPIO (errorpointer)\n", __func__); \ + return PTR_ERR(desc); \ + } \ if (!desc->gdev) { \ - pr_warn("%s: invalid GPIO\n", __func__); \ + pr_warn("%s: invalid GPIO (no device)\n", __func__); \ return -EINVAL; \ } \ if ( !desc->gdev->chip ) { \ @@ -1386,8 +1390,12 @@ done: #define VALIDATE_DESC_VOID(desc) do { \ if (!desc) \ return; \ + if (IS_ERR(desc)) { \ + pr_warn("%s: invalid GPIO (errorpointer)\n", __func__); \ + return; \ + } \ if (!desc->gdev) { \ - pr_warn("%s: invalid GPIO\n", __func__); \ + pr_warn("%s: invalid GPIO (no device)\n", __func__); \ return; \ } \ if (!desc->gdev->chip) { \ @@ -2061,7 +2069,7 @@ int gpiod_to_irq(const struct gpio_desc *desc) * requires this function to not return zero on an invalid descriptor * but rather a negative error number. */ - if (!desc || !desc->gdev || !desc->gdev->chip) + if (!desc || IS_ERR(desc) || !desc->gdev || !desc->gdev->chip) return -EINVAL; chip = desc->gdev->chip; |