4.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Wei Yongjun <weiyongjun1@xxxxxxxxxx> [ 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@xxxxxxxxxx> Acked-by: Robert Jarzmik <robert.jarzmik@xxxxxxx> Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx> Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/gpio/gpio-pxa.c | 2 ++ 1 file changed, 2 insertions(+) --- a/drivers/gpio/gpio-pxa.c +++ b/drivers/gpio/gpio-pxa.c @@ -665,6 +665,8 @@ static int pxa_gpio_probe(struct platfor 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)
