linux-kernel - [PATCH] regulator: max8660: fix assignment of pdata to data that becomes dead

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Message-Id: <1428444406-4641-1-git-send-email-colin.king@canonical.com>
Date:	Tue,  7 Apr 2015 23:06:46 +0100
From:	Colin King <colin.king@...onical.com>
To:	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] regulator: max8660: fix assignment of pdata to data that becomes dead

From: Colin Ian King <colin.king@...onical.com>

pdata is assigned to &pdata_of, however, pdata_of becomes dead (when it
goes out of scope) so pdata effectively becomes a dead pointer to the
out of scope object.  This is detected by static analysis:

[drivers/regulator/max8660.c:411]: (error) Dead pointer usage.
  Pointer 'pdata' is dead if it has been assigned '&pdata_of' at line 404.

Move declaration of pdata_of so it is always in scope.

Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/regulator/max8660.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/regulator/max8660.c b/drivers/regulator/max8660.c
index 7eee2ca..f187c8f 100644
--- a/drivers/regulator/max8660.c
+++ b/drivers/regulator/max8660.c
@@ -382,7 +382,7 @@ static int max8660_probe(struct i2c_client *client,
 				   const struct i2c_device_id *i2c_id)
 {
 	struct device *dev = &client->dev;
-	struct max8660_platform_data *pdata = dev_get_platdata(dev);
+	struct max8660_platform_data pdata_of, *pdata = dev_get_platdata(dev);
 	struct regulator_config config = { };
 	struct max8660 *max8660;
 	int boot_on, i, id, ret = -EINVAL;
@@ -391,7 +391,6 @@ static int max8660_probe(struct i2c_client *client,
 
 	if (dev->of_node && !pdata) {
 		const struct of_device_id *id;
-		struct max8660_platform_data pdata_of;
 
 		id = of_match_device(of_match_ptr(max8660_dt_ids), dev);
 		if (!id)
-- 
2.1.4

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