This is a note to let you know that I've just added the patch titled
power: supply: ltc2941-battery-gauge: fix use-after-free
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-ltc2941-battery-gauge-fix-use-after-free.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.
>From a60ec78d306c6548d4adbc7918b587a723c555cc Mon Sep 17 00:00:00 2001
From: Sven Van Asbroeck <thesven73@xxxxxxxxx>
Date: Thu, 19 Sep 2019 11:11:37 -0400
Subject: power: supply: ltc2941-battery-gauge: fix use-after-free
From: Sven Van Asbroeck <thesven73@xxxxxxxxx>
commit a60ec78d306c6548d4adbc7918b587a723c555cc upstream.
This driver's remove path calls cancel_delayed_work().
However, that function does not wait until the work function
finishes. This could mean that the work function is still
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
that the work is properly cancelled, no longer running, and
unable to re-schedule itself.
This issue was detected with the help of Coccinelle.
Cc: stable <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Sven Van Asbroeck <TheSven73@xxxxxxxxx>
Signed-off-by: Sebastian Reichel <sebastian.reichel@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/power/supply/ltc2941-battery-gauge.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/power/supply/ltc2941-battery-gauge.c
+++ b/drivers/power/supply/ltc2941-battery-gauge.c
@@ -448,7 +448,7 @@ static int ltc294x_i2c_remove(struct i2c
{
struct ltc294x_info *info = i2c_get_clientdata(client);
- cancel_delayed_work(&info->work);
+ cancel_delayed_work_sync(&info->work);
power_supply_unregister(info->supply);
return 0;
}
Patches currently in stable-queue which might be from thesven73@xxxxxxxxx are
queue-4.19/power-supply-ltc2941-battery-gauge-fix-use-after-free.patch
