linux-kernel - [PATCH v2] gpio: ath79: Fix potential NULL dereference in ath79_gpio

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Date:   Sun, 25 Mar 2018 00:40:48 +0100
From:   Alban Bedel <albeu@...e.fr>
To:     linux-gpio@...r.kernel.org
Cc:     Wei Yongjun <weiyongjun1@...wei.com>, Alban Bedel <albeu@...e.fr>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2] gpio: ath79: Fix potential NULL dereference in ath79_gpio_probe()

From: Wei Yongjun <weiyongjun1@...wei.com>

platform_get_resource() may return NULL, add proper
check to avoid potential NULL dereferencing.

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@...wei.com>
[albeu@...e.fr: Fixed patch to apply on current tree]
Signed-off-by: Alban Bedel <albeu@...e.fr>
---
 drivers/gpio/gpio-ath79.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpio/gpio-ath79.c b/drivers/gpio/gpio-ath79.c
index 3ae7c18..684e9d6 100644
--- a/drivers/gpio/gpio-ath79.c
+++ b/drivers/gpio/gpio-ath79.c
@@ -258,6 +258,8 @@ static int ath79_gpio_probe(struct platform_device *pdev)
 	}
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res)
+		return -EINVAL;
 	ctrl->base = devm_ioremap_nocache(
 		&pdev->dev, res->start, resource_size(res));
 	if (!ctrl->base)
-- 
2.7.4