linux-kernel - [RFT PATCH] power: bq2415x_charger: Properly handle ENODEV from power_supply_get_by

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Date:	Tue, 14 Oct 2014 10:32:53 +0200
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Sebastian Reichel <sre@...nel.org>,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	stable@...r.kernel.org
Subject: [RFT PATCH] power: bq2415x_charger: Properly handle ENODEV from
 power_supply_get_by_phandle

The power_supply_get_by_phandle() on error returns ENODEV or NULL.
The driver later expects obtained pointer to power supply to be
valid or NULL. If it is not NULL then it dereferences it in
bq2415x_notifier_call() which would lead to dereferencing ENODEV-value
pointer.

Properly handle the power_supply_get_by_phandle() error case and abort probe.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
Fixes: faffd234cf85 ("bq2415x_charger: Add DT support")
Cc: <stable@...r.kernel.org>
---
 drivers/power/bq2415x_charger.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/power/bq2415x_charger.c b/drivers/power/bq2415x_charger.c
index e384844a1ae1..d9c457217b6a 100644
--- a/drivers/power/bq2415x_charger.c
+++ b/drivers/power/bq2415x_charger.c
@@ -1579,8 +1579,13 @@ static int bq2415x_probe(struct i2c_client *client,
 	if (np) {
 		bq->notify_psy = power_supply_get_by_phandle(np, "ti,usb-charger-detection");
 
-		if (!bq->notify_psy)
+		if (!bq->notify_psy) {
 			return -EPROBE_DEFER;
+		} else if (IS_ERR(bq->notify_psy)) {
+			dev_err(&client->dev, "no 'ti,usb-charger-detection' property\n");
+			ret = PTR_ERR(bq->notify_psy);
+			goto error_2;
+		}
 	}
 	else if (pdata->notify_device)
 		bq->notify_psy = power_supply_get_by_name(pdata->notify_device);
-- 
1.9.1

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