From 9506755633d0b32ef76f67c345000178e9b0dfc4 Mon Sep 17 00:00:00 2001 From: Wei Yongjun Date: Wed, 11 Jul 2018 13:19:38 +0000 Subject: [PATCH] gpio: pxa: Fix potential NULL dereference platform_get_resource() may fail and return NULL, so we should better check it's return value to avoid a NULL pointer dereference a bit later in the code. This is detected by Coccinelle semantic patch. @@ expression pdev, res, n, t, e, e1, e2; @@ res = platform_get_resource(pdev, t, n); + if (!res) + return -EINVAL; ... when != res == NULL e = devm_ioremap(e1, res->start, e2); Signed-off-by: Wei Yongjun Acked-by: Robert Jarzmik Signed-off-by: Linus Walleij --- drivers/gpio/gpio-pxa.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/gpio/gpio-pxa.c b/drivers/gpio/gpio-pxa.c index 1e66f808051c..0d09a4fcef49 100644 --- a/drivers/gpio/gpio-pxa.c +++ b/drivers/gpio/gpio-pxa.c @@ -646,6 +646,8 @@ static int pxa_gpio_probe(struct platform_device *pdev) pchip->irq0 = irq0; pchip->irq1 = irq1; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) + return -EINVAL; gpio_reg_base = devm_ioremap(&pdev->dev, res->start, resource_size(res)); if (!gpio_reg_base)