[PATCH 3.17 097/141] power: bq2415x_charger: Properly handle ENODEV from power_supply_get_by_phandle

From: Greg Kroah-Hartman
Date: Wed Nov 19 2014 - 17:16:25 EST

3.17-stable review patch. If anyone has any objections, please let me know.


From: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx>

commit 0eaf437aa14949d2230aeab7364f4ab47901304a upstream.

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

Properly handle the power_supply_get_by_phandle() error case by
replacing error value with NULL. This indicates that usb charger
detection won't be used.

Fix also memory leak of 'name' if power_supply_get_by_phandle() fails
with NULL and probe should defer.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx>
Fixes: faffd234cf85 ("bq2415x_charger: Add DT support")
[small fix regarding the missing ti,usb-charger-detection info message]
Signed-off-by: Sebastian Reichel <sre@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

drivers/power/bq2415x_charger.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)

--- a/drivers/power/bq2415x_charger.c
+++ b/drivers/power/bq2415x_charger.c
@@ -1579,8 +1579,15 @@ static int bq2415x_probe(struct i2c_clie
if (np) {
bq->notify_psy = power_supply_get_by_phandle(np, "ti,usb-charger-detection");

- if (!bq->notify_psy)
- return -EPROBE_DEFER;
+ if (IS_ERR(bq->notify_psy)) {
+ dev_info(&client->dev,
+ "no 'ti,usb-charger-detection' property (err=%ld)\n",
+ PTR_ERR(bq->notify_psy));
+ bq->notify_psy = NULL;
+ } else if (!bq->notify_psy) {
+ ret = -EPROBE_DEFER;
+ goto error_2;
+ }
else if (pdata->notify_device)
bq->notify_psy = power_supply_get_by_name(pdata->notify_device);

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