From 9506755633d0b32ef76f67c345000178e9b0dfc4 Mon Sep 17 00:00:00 2001
From: Wei Yongjun <weiyongjun1@huawei.com>
Date: Wed, 11 Jul 2018 13:19:38 +0000
Subject: [PATCH] gpio: pxa: Fix potential NULL dereference
Git-commit: 9506755633d0b32ef76f67c345000178e9b0dfc4
Patch-mainline: v4.19-rc1
References: bsc#1051510
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>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
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)
--
2.18.0