CVE-2023-54079

In the Linux kernel, the following vulnerability has been resolved:

power: supply: bq27xxx: Fix poll_interval handling and races on remove

Before this patch bq27xxxbatteryteardown() was setting pollinterval = 0 to avoid bq27xxxbatteryupdate() requeuing the delayedwork item.

There are 2 problems with this:

1. If the driver is unbound through sysfs, rather then the module being rmmod-ed, this changes poll_interval unexpectedly

2. This is racy, after it being set pollinterval could be changed before bq27xxxbatteryupdate() checks it through /sys/module/bq27xxxbattery/parameters/poll_interval

Fix this by added a removed attribute to struct bq27xxxdeviceinfo and using that instead of setting poll_interval to 0.

There also is another pollinterval related race on remove(), writing /sys/module/bq27xxxbattery/parameters/pollinterval will requeue the delayedwork item for all devices on the bq27xxxbatterydevices list and the device being removed was only removed from that list after cancelling the delayed_work item.

Fix this by moving the removal from the bq27xxxbatterydevices list to before cancelling the delayed_work item.