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power: supply: s3c_adc_battery: fix possible use-after-free in s3c_adc_bat_remove()

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[ Upstream commit 68ae256945 ]

This driver's remove path calls cancel_delayed_work(). However, that
function does not wait until the work function finishes. This means
that the callback function may still be running after the driver's
remove function has finished, which would result in a use-after-free.

Fix by calling cancel_delayed_work_sync(), which ensures that
the work is properly cancelled, no longer running, and unable
to re-schedule itself.

Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Yang Yingliang
2021-04-07 17:19:03 +08:00
committed by Greg Kroah-Hartman
parent ccb098c053
commit a931c5791b
1 changed files with 1 additions and 1 deletions
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2
drivers/power/supply/s3c_adc_battery.c
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@@ -394,7 +394,7 @@ static int s3c_adc_bat_remove(struct platform_device *pdev)
gpio_free(pdata->gpio_charge_finished);
}
cancel_delayed_work(&bat_work);
cancel_delayed_work_sync(&bat_work);
if (pdata->exit)
pdata->exit();