diff options
| author | Krzysztof Kozlowski <k.kozlowski@samsung.com> | 2015-02-20 14:32:24 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-05-06 22:03:45 +0200 |
| commit | 640e9bd83b3a3bc313eb0ade22effbab5c135a76 (patch) | |
| tree | ef14e7f2065b44273e5b15e8ef3b37858318e1e3 | |
| parent | a8cb866f5168eaec313528f7059b0025b859cccf (diff) | |
power_supply: ipaq_micro_battery: Check return values in probe
commit a2c1d531854c4319610f1d83351213b47a633969 upstream.
The return values of create_singlethread_workqueue() and
power_supply_register() calls were not checked and even on error probe()
function returned 0.
1. If allocation of workqueue failed (returning NULL) then further
accesses could lead to NULL pointer dereference. The
queue_delayed_work() expects workqueue to be non-NULL.
2. If registration of power supply failed then during unbind the driver
tried to unregister power supply which was not actually registered.
This could lead to memory corruption because
power_supply_unregister() unconditionally cleans up given power
supply.
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Fixes: 00a588f9d27f ("power: add driver for battery reading on iPaq h3xxx")
Signed-off-by: Sebastian Reichel <sre@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/power/ipaq_micro_battery.c | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/drivers/power/ipaq_micro_battery.c b/drivers/power/ipaq_micro_battery.c index 698cf1636bb8..96b15e003f3f 100644 --- a/drivers/power/ipaq_micro_battery.c +++ b/drivers/power/ipaq_micro_battery.c @@ -226,6 +226,7 @@ static struct power_supply micro_ac_power = { static int micro_batt_probe(struct platform_device *pdev) { struct micro_battery *mb; + int ret; mb = devm_kzalloc(&pdev->dev, sizeof(*mb), GFP_KERNEL); if (!mb) @@ -233,14 +234,30 @@ static int micro_batt_probe(struct platform_device *pdev) mb->micro = dev_get_drvdata(pdev->dev.parent); mb->wq = create_singlethread_workqueue("ipaq-battery-wq"); + if (!mb->wq) + return -ENOMEM; + INIT_DELAYED_WORK(&mb->update, micro_battery_work); platform_set_drvdata(pdev, mb); queue_delayed_work(mb->wq, &mb->update, 1); - power_supply_register(&pdev->dev, µ_batt_power); - power_supply_register(&pdev->dev, µ_ac_power); + + ret = power_supply_register(&pdev->dev, µ_batt_power); + if (ret < 0) + goto batt_err; + + ret = power_supply_register(&pdev->dev, µ_ac_power); + if (ret < 0) + goto ac_err; dev_info(&pdev->dev, "iPAQ micro battery driver\n"); return 0; + +ac_err: + power_supply_unregister(µ_ac_power); +batt_err: + cancel_delayed_work_sync(&mb->update); + destroy_workqueue(mb->wq); + return ret; } static int micro_batt_remove(struct platform_device *pdev) |