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Change History

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

PM: EM: Fix potential division-by-zero error in em_compute_costs()

When the device is of a non-CPU type, table[i].performance won't be
initialized in the previous em_init_performance(), resulting in division
by zero when calculating costs in em_compute_costs().

Since the 'cost' algorithm is only used for EAS energy efficiency
calculations and is currently not utilized by other device drivers, we
should add the _is_cpu_device(dev) check to prevent this division-by-zero
issue.

https://git.kernel.org/stable/c/14cbdd64f3870cf0a2d94b87919b9056448c59a0

https://git.kernel.org/stable/c/179c0c7044a378198adb36f2a12410ab68cc730a

https://git.kernel.org/stable/c/81d72f9241d884ec29524431f74f8009310cfa0c