linux-kernel - [PATCH] power_supply: pm2301_charger: Fix NULL pointer dereference

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Date:	Thu, 16 May 2013 17:31:00 +0800
From:	Axel Lin <axel.lin@...ics.com>
To:	Anton Vorontsov <cbou@...l.ru>
Cc:	Rupesh Kumar <rupesh.kumar@...ricsson.com>,
	Michel JAOUEN <michel.jaouen@...ricsson.com>,
	Loic Pallardy <loic.pallardy@...ricsson.com>,
	David Woodhouse <dwmw2@...radead.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] power_supply: pm2301_charger: Fix NULL pointer dereference

Add checking pl_data in probe, this prevent possible NULL pointer dereference.
Also fix NULL pointer deference in dev_err when allocate memory for pm2 fails.

Signed-off-by: Axel Lin <axel.lin@...ics.com>
---
 drivers/power/pm2301_charger.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/power/pm2301_charger.c b/drivers/power/pm2301_charger.c
index a441751..c972389 100644
--- a/drivers/power/pm2301_charger.c
+++ b/drivers/power/pm2301_charger.c
@@ -1007,9 +1007,14 @@ static int pm2xxx_wall_charger_probe(struct i2c_client *i2c_client,
 	u8 val;
 	int i;
 
+	if (!pl_data) {
+		dev_err(&i2c_client->dev, "No platform data supplied\n");
+		return -EINVAL;
+	}
+
 	pm2 = kzalloc(sizeof(struct pm2xxx_charger), GFP_KERNEL);
 	if (!pm2) {
-		dev_err(pm2->dev, "pm2xxx_charger allocation failed\n");
+		dev_err(&i2c_client->dev, "pm2xxx_charger allocation failed\n");
 		return -ENOMEM;
 	}
 
-- 
1.8.1.2



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