Patch "power_supply: ipaq_micro_battery: Check return values in probe" has been added to the 4.0-stable tree

Patch "power_supply: ipaq_micro_battery: Check return values in probe" has been added to the 4.0-stable tree

[gregkh]

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@vger.kernel.org> know about it.


>From a2c1d531854c4319610f1d83351213b47a633969 Mon Sep 17 00:00:00 2001
From: Krzysztof Kozlowski <k.kozlowski@samsung.com>
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@samsung.com>

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>

---
 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, &micro_batt_power);
-	power_supply_register(&pdev->dev, &micro_ac_power);
+
+	ret = power_supply_register(&pdev->dev, &micro_batt_power);
+	if (ret < 0)
+		goto batt_err;
+
+	ret = power_supply_register(&pdev->dev, &micro_ac_power);
+	if (ret < 0)
+		goto ac_err;
 
 	dev_info(&pdev->dev, "iPAQ micro battery driver\n");
 	return 0;
+
+ac_err:
+	power_supply_unregister(&micro_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@samsung.com 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