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Change History

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

power: supply: axp288_fuel_gauge: Fix external_power_changed race

fuel_gauge_external_power_changed() dereferences info->bat,
which gets sets in axp288_fuel_gauge_probe() like this:

  info->bat = devm_power_supply_register(dev, &fuel_gauge_desc, &psy_cfg);

As soon as devm_power_supply_register() has called device_add()
the external_power_changed callback can get called. So there is a window
where fuel_gauge_external_power_changed() may get called while
info->bat has not been set yet leading to a NULL pointer dereference.

Fixing this is easy. The external_power_changed callback gets passed
the power_supply which will eventually get stored in info->bat,
so fuel_gauge_external_power_changed() can simply directly use
the passed in psy argument which is always valid.

https://git.kernel.org/stable/c/0456b912121e45b3ef54abe3135e5dcb541f956c

https://git.kernel.org/stable/c/a636c6ba9ce898207f283271cb28511206ab739b

https://git.kernel.org/stable/c/f8319774d6f1567d6e7d03653174ab0c82c5c66d