linux-kernel - [PATCH] gpio: syscon: fix a possible NULL dereference

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Date:	Thu,  5 Nov 2015 17:02:35 +0100
From:	LABBE Corentin <clabbe.montjoie@...il.com>
To:	linus.walleij@...aro.org, gnurou@...il.com
Cc:	linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
	LABBE Corentin <clabbe.montjoie@...il.com>
Subject: [PATCH] gpio: syscon: fix a possible NULL dereference

of_match_device could return NULL, and so cause a NULL pointer
dereference later at line 199:
priv->flags = of_id->data;

Reported-by: coverity (CID 1324140)
Signed-off-by: LABBE Corentin <clabbe.montjoie@...il.com>
---
 drivers/gpio/gpio-syscon.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpio/gpio-syscon.c b/drivers/gpio/gpio-syscon.c
index 045a952..e673c58 100644
--- a/drivers/gpio/gpio-syscon.c
+++ b/drivers/gpio/gpio-syscon.c
@@ -192,6 +192,9 @@ static int syscon_gpio_probe(struct platform_device *pdev)
 	struct device_node *np = dev->of_node;
 	int ret;
 
+	if (!of_id)
+		return -ENODEV;
+
 	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;
-- 
2.4.10

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