From mboxrd@z Thu Jan 1 00:00:00 1970 From: Linus Walleij Subject: [PATCH] gpio: make library immune to error pointers Date: Thu, 16 Jun 2016 11:59:20 +0200 Message-ID: <1466071160-16722-1-git-send-email-linus.walleij@linaro.org> Return-path: Sender: stable-owner@vger.kernel.org To: linux-gpio@vger.kernel.org, Alexandre Courbot , Grygorii Strashko Cc: Linus Walleij , stable@vger.kernel.org List-Id: linux-gpio@vger.kernel.org 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 Signed-off-by: Linus Walleij --- drivers/gpio/gpiolib.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index f39bf05993e7..1a8dbc791892 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -1371,7 +1371,7 @@ done: * optional GPIO and calls should just bail out. */ #define VALIDATE_DESC(desc) do { \ - if (!desc) \ + if (!desc || IS_ERR(desc)) \ return 0; \ if (!desc->gdev) { \ pr_warn("%s: invalid GPIO\n", __func__); \ @@ -1384,7 +1384,7 @@ done: } } while (0) #define VALIDATE_DESC_VOID(desc) do { \ - if (!desc) \ + if (!desc || IS_ERR(desc)) \ return; \ if (!desc->gdev) { \ pr_warn("%s: invalid GPIO\n", __func__); \ @@ -2061,7 +2061,7 @@ 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; -- 2.4.11