Commit a60ec78d authored by Sven Van Asbroeck's avatar Sven Van Asbroeck Committed by Sebastian Reichel

power: supply: ltc2941-battery-gauge: fix use-after-free

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@vger.kernel.org>
Signed-off-by: default avatarSven Van Asbroeck <TheSven73@gmail.com>
Signed-off-by: default avatarSebastian Reichel <sebastian.reichel@collabora.com>
parent e29242ad
...@@ -449,7 +449,7 @@ static int ltc294x_i2c_remove(struct i2c_client *client) ...@@ -449,7 +449,7 @@ static int ltc294x_i2c_remove(struct i2c_client *client)
{ {
struct ltc294x_info *info = i2c_get_clientdata(client); struct ltc294x_info *info = i2c_get_clientdata(client);
cancel_delayed_work(&info->work); cancel_delayed_work_sync(&info->work);
power_supply_unregister(info->supply); power_supply_unregister(info->supply);
return 0; return 0;
} }
......
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