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 4.19-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-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 183f219092c3a2553b2afcc70aebe120afe0fb12
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();
