linux-kernel - [PATCH] HID: input: Fix NULL pointer dereference when power_supply

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Message-id: <1427124891-30540-1-git-send-email-k.kozlowski@samsung.com>
Date:	Mon, 23 Mar 2015 16:34:51 +0100
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Jiri Kosina <jkosina@...e.cz>, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org
Cc:	Sebastian Reichel <sre@...nel.org>,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Dan Carpenter <dan.carpenter@...cle.com>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>
Subject: [PATCH] HID: input: Fix NULL pointer dereference when
 power_supply_register fails

Do not call power_supply_powers() if power_supply_register() failed
earlier. This fixes possible NULL pointer dereference by
power_supply_powers() in such case.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>

---

The patch was prepared on top of next-20150323. It depends on changes in
power supply core (battery-2.6.git) so probably it should be applied to
the battery tree.
---
 drivers/hid/hid-input.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
index a70fa4d7f8f9..008e89bf6f3c 100644
--- a/drivers/hid/hid-input.c
+++ b/drivers/hid/hid-input.c
@@ -452,10 +452,10 @@ static bool hidinput_setup_battery(struct hid_device *dev, unsigned report_type,
 		kfree(psy_desc->name);
 		kfree(psy_desc);
 		dev->battery = NULL;
+	} else {
+		power_supply_powers(dev->battery, &dev->dev);
 	}
 
-	power_supply_powers(dev->battery, &dev->dev);
-
 out:
 	return true;
 }
-- 
1.9.1

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