From: Wei Yongjun weiyongjun1@huawei.com
[ Upstream commit 9506755633d0b32ef76f67c345000178e9b0dfc4 ]
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 weiyongjun1@huawei.com Acked-by: Robert Jarzmik robert.jarzmik@free.fr Signed-off-by: Linus Walleij linus.walleij@linaro.org Signed-off-by: Sasha Levin alexander.levin@microsoft.com --- 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 6029899789f3..2943dfc4c470 100644 --- a/drivers/gpio/gpio-pxa.c +++ b/drivers/gpio/gpio-pxa.c @@ -662,6 +662,8 @@ 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)