This is a note to let you know that I've just added the patch titled power: supply: s3c_adc_battery: fix possible use-after-free in s3c_adc_bat_remove() to the 5.4-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-s3c_adc_battery-fix-possible-use-after-.patch and it can be found in the queue-5.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit b6c414d7d6237071964ad84c4a9ea958b655ce8e Author: Yang Yingliang <yangyingliang@xxxxxxxxxx> Date: Wed Apr 7 17:19:03 2021 +0800 power: supply: s3c_adc_battery: fix possible use-after-free in s3c_adc_bat_remove() [ Upstream commit 68ae256945d2abe9036a7b68af4cc65aff79d5b7 ] 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@xxxxxxxxxx> Signed-off-by: Yang Yingliang <yangyingliang@xxxxxxxxxx> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxxxxx> Signed-off-by: Sebastian Reichel <sebastian.reichel@xxxxxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/power/supply/s3c_adc_battery.c b/drivers/power/supply/s3c_adc_battery.c index 3d00b35cafc9..8be31f80035c 100644 --- a/drivers/power/supply/s3c_adc_battery.c +++ b/drivers/power/supply/s3c_adc_battery.c @@ -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();