From 09445a103eb4e6a0b881056c1dc5f4ca8a186671 Mon Sep 17 00:00:00 2001 From: Bartosz Golaszewski Date: Thu, 25 May 2017 10:37:36 +0200 Subject: [PATCH] gpio: pch: check the return value of irq_alloc_generic_chip() This function can fail, so check the return value before dereferencing the returned pointer. Signed-off-by: Bartosz Golaszewski Signed-off-by: Linus Walleij --- drivers/gpio/gpio-pch.c | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-) diff --git a/drivers/gpio/gpio-pch.c b/drivers/gpio/gpio-pch.c index 71bc6da11337..f6600f8ada52 100644 --- a/drivers/gpio/gpio-pch.c +++ b/drivers/gpio/gpio-pch.c @@ -331,14 +331,18 @@ static irqreturn_t pch_gpio_handler(int irq, void *dev_id) return ret; } -static void pch_gpio_alloc_generic_chip(struct pch_gpio *chip, - unsigned int irq_start, unsigned int num) +static int pch_gpio_alloc_generic_chip(struct pch_gpio *chip, + unsigned int irq_start, + unsigned int num) { struct irq_chip_generic *gc; struct irq_chip_type *ct; gc = irq_alloc_generic_chip("pch_gpio", 1, irq_start, chip->base, handle_simple_irq); + if (!gc) + return -ENOMEM; + gc->private = chip; ct = gc->chip_types; @@ -349,6 +353,8 @@ static void pch_gpio_alloc_generic_chip(struct pch_gpio *chip, irq_setup_generic_chip(gc, IRQ_MSK(num), IRQ_GC_INIT_MASK_CACHE, IRQ_NOREQUEST | IRQ_NOPROBE, 0); + + return 0; } static int pch_gpio_probe(struct pci_dev *pdev, @@ -425,7 +431,10 @@ static int pch_gpio_probe(struct pci_dev *pdev, goto err_request_irq; } - pch_gpio_alloc_generic_chip(chip, irq_base, gpio_pins[chip->ioh]); + ret = pch_gpio_alloc_generic_chip(chip, irq_base, + gpio_pins[chip->ioh]); + if (ret) + goto err_request_irq; end: return 0; -- 2.20.1