linux-kernel - [PATCH] regulator: Avoid potential NULL dereference in reg_fixed_voltage

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Date:	Sun, 27 Nov 2011 10:13:50 +0800
From:	Axel Lin <axel.lin@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	Rajendra Nayak <rnayak@...com>, Liam Girdwood <lrg@...com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Subject: [PATCH] regulator: Avoid potential NULL dereference in
 reg_fixed_voltage_probe()

of_get_fixed_voltage_config() may return NULL, return -ENOMEM in this case
so we don't dereference NULL pointer.

Signed-off-by: Axel Lin <axel.lin@...il.com>
---
 drivers/regulator/fixed.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/drivers/regulator/fixed.c b/drivers/regulator/fixed.c
index 639e19d..2f917a1 100644
--- a/drivers/regulator/fixed.c
+++ b/drivers/regulator/fixed.c
@@ -166,8 +166,11 @@ static int __devinit reg_fixed_voltage_probe(struct platform_device *pdev)
 	struct fixed_voltage_data *drvdata;
 	int ret;
 
-	if (pdev->dev.of_node)
+	if (pdev->dev.of_node) {
 		config = of_get_fixed_voltage_config(&pdev->dev);
+		if (!config)
+			return -ENOMEM;
+	}
 
 	drvdata = kzalloc(sizeof(struct fixed_voltage_data), GFP_KERNEL);
 	if (drvdata == NULL) {
-- 
1.7.5.4



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