This is a note to let you know that I've just added the patch titled power_supply: ipaq_micro_battery: Check return values in probe to the 4.0-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: power_supply-ipaq_micro_battery-check-return-values-in-probe.patch and it can be found in the queue-4.0 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From a2c1d531854c4319610f1d83351213b47a633969 Mon Sep 17 00:00:00 2001 From: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx> Date: Fri, 20 Feb 2015 14:32:24 +0100 Subject: power_supply: ipaq_micro_battery: Check return values in probe From: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx> 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@xxxxxxxxxxx> Fixes: 00a588f9d27f ("power: add driver for battery reading on iPaq h3xxx") Signed-off-by: Sebastian Reichel <sre@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/power/ipaq_micro_battery.c | 21 +++++++++++++++++++-- 1 file changed, 19 insertions(+), 2 deletions(-) --- a/drivers/power/ipaq_micro_battery.c +++ b/drivers/power/ipaq_micro_battery.c @@ -226,6 +226,7 @@ static struct power_supply micro_ac_powe 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 platf 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) Patches currently in stable-queue which might be from k.kozlowski@xxxxxxxxxxx are queue-4.0/compal-laptop-fix-leaking-hwmon-device.patch queue-4.0/compal-laptop-check-return-value-of-power_supply_register.patch queue-4.0/power_supply-twl4030_madc-check-return-value-of-power_supply_register.patch queue-4.0/power_supply-ipaq_micro_battery-fix-leaking-workqueue.patch queue-4.0/power_supply-lp8788-charger-fix-leaked-power-supply-on-probe-fail.patch queue-4.0/power_supply-ipaq_micro_battery-check-return-values-in-probe.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html