From c94a3d403299f64d2f91346ff64c4b95747c123c Mon Sep 17 00:00:00 2001 From: Krzysztof Kozlowski Date: Fri, 20 Mar 2015 10:26:02 +0100 Subject: power_supply: 88pm860x_charger: Fix possible NULL pointer dereference and use of initialized variable MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Do not put reference to power supply in early exit paths of pm860x_done_handler() because: 1. it is not yet initialized, 2. it is NULL. This fixes possible NULL pointer dereference and following build warning: drivers/power/88pm860x_charger.c: In function ‘pm860x_done_handler’: drivers/power/88pm860x_charger.c:516:18: warning: ‘psy’ may be used uninitialized in this function [-Wmaybe-uninitialized] Additionally this puts the power supply reference before unlocking mutex. This actually is not needed (there is no race here) but has logical sense and makes the exit paths cleaner. Reported-by: kbuild test robot Signed-off-by: Krzysztof Kozlowski Signed-off-by: Sebastian Reichel --- drivers/power/88pm860x_charger.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/power/88pm860x_charger.c b/drivers/power/88pm860x_charger.c index bf822aa00c14..0e448c68c02b 100644 --- a/drivers/power/88pm860x_charger.c +++ b/drivers/power/88pm860x_charger.c @@ -495,7 +495,7 @@ static irqreturn_t pm860x_done_handler(int irq, void *data) ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_VOLTAGE_NOW, &val); if (ret) - goto out; + goto out_psy_put; vbatt = val.intval / 1000; /* * CHG_DONE interrupt is faster than CHG_DET interrupt when @@ -506,14 +506,15 @@ static irqreturn_t pm860x_done_handler(int irq, void *data) */ ret = pm860x_reg_read(info->i2c, PM8607_STATUS_2); if (ret < 0) - goto out; + goto out_psy_put; if (vbatt > CHARGE_THRESHOLD && ret & STATUS2_CHG) power_supply_set_property(psy, POWER_SUPPLY_PROP_CHARGE_FULL, &val); +out_psy_put: + power_supply_put(psy); out: mutex_unlock(&info->lock); - power_supply_put(psy); dev_dbg(info->dev, "%s, Allowed: %d\n", __func__, info->allowed); set_charging_fsm(info); -- cgit v1.2.3