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compal-laptop: Check return value of power_supply_register 

The return value of power_supply_register() call was not checked and
even on error probe() function returned 0. If registering 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.

Fix this by checking return status of power_supply_register() call. In
case of failure, clean up sysfs entries and fail the probe.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Fixes: 9be0fcb5ed ("compal-laptop: add JHL90, battery & hwmon interface")
Cc: <stable@vger.kernel.org>
Signed-off-by: Sebastian Reichel <sre@kernel.org>
This commit is contained in:
Krzysztof Kozlowski 2015-03-12 08:44:00 +01:00 committed by Sebastian Reichel
parent ad774702f1
commit 1915a718b1
1 changed files with 3 additions and 1 deletions
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4
drivers/platform/x86/compal-laptop.c
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@ -1036,7 +1036,9 @@ static int compal_probe(struct platform_device *pdev)
/* Power supply */
initialize_power_supply_data(data);
power_supply_register(&compal_device->dev, &data->psy);
err = power_supply_register(&compal_device->dev, &data->psy);
if (err < 0)
goto remove;
platform_set_drvdata(pdev, data);