linux-kernel - [PATCH] regulator: lp872x: Return -EINVAL if pdata is NULL

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Date:	Wed, 20 Jun 2012 16:13:15 +0800
From:	Axel Lin <axel.lin@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	"Milo(Woogyom) Kim" <milo.kim@...com>, Liam Girdwood <lrg@...com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Subject: [PATCH] regulator: lp872x: Return -EINVAL if pdata is NULL

Return -EINVAL if pdata is NULL, otherwise we have NULL dereference bug.
This patch also moves the code checking pdata earlier in lp872x_probe.

Signed-off-by: Axel Lin <axel.lin@...il.com>
---
 drivers/regulator/lp872x.c |   10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/regulator/lp872x.c b/drivers/regulator/lp872x.c
index d51d098..e8f54ef 100644
--- a/drivers/regulator/lp872x.c
+++ b/drivers/regulator/lp872x.c
@@ -785,11 +785,6 @@ static int lp872x_config(struct lp872x *lp)
 	struct lp872x_platform_data *pdata = lp->pdata;
 	int ret;
 
-	if (!pdata) {
-		dev_warn(lp->dev, "no platform data\n");
-		return 0;
-	}
-
 	if (!pdata->update_config)
 		return 0;
 
@@ -889,6 +884,11 @@ static int lp872x_probe(struct i2c_client *cl, const struct i2c_device_id *id)
 		[LP8725] = LP8725_NUM_REGULATORS,
 	};
 
+	if (!pdata) {
+		dev_warn(&cl->dev, "no platform data\n");
+		return -EINVAL;
+	}
+
 	lp = devm_kzalloc(&cl->dev, sizeof(struct lp872x), GFP_KERNEL);
 	if (!lp)
 		goto err_mem;
-- 
1.7.9.5



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