From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Wei Yongjun , Robert Jarzmik , Linus Walleij , Sasha Levin Subject: [PATCH 4.9 090/111] gpio: pxa: Fix potential NULL dereference Date: Mon, 24 Sep 2018 13:52:57 +0200 Message-Id: <20180924113113.738665058@linuxfoundation.org> In-Reply-To: <20180924113103.337261320@linuxfoundation.org> References: <20180924113103.337261320@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Wei Yongjun [ 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 Acked-by: Robert Jarzmik Signed-off-by: Linus Walleij Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- drivers/gpio/gpio-pxa.c | 2 ++ 1 file changed, 2 insertions(+) --- a/drivers/gpio/gpio-pxa.c +++ b/drivers/gpio/gpio-pxa.c @@ -660,6 +660,8 @@ 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)