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

irqchip/crossbar: Use correct index in crossbar_domain_free()

crossbar_domain_free() resets the domain data and then uses the nulled
out irq_data->hwirq member as index to reset the irq_map[] entry and to
write the relevant crossbar register with a safe entry. That means it
never frees the correct index and keeps the crossbar register connection
to the source interrupt active.

If it would not reset the domain data, then this would be even worse as
irq_data->hwirq holds the source interrupt number, but both the map and
register index need the corresponding GIC SPI number and not the source
interrupt number. This might even result in an out of bounds access as
the source interrupt number can be higher than the maximal index space.

Fix this by using the GIC SPI index from the parent domain's irq_data.

https://git.kernel.org/stable/c/043db005a8d6932dc7d217c86307e9af0bc10ddc

https://git.kernel.org/stable/c/13bdb5140405ff283f9052e65ee1d5c2303765c7

https://git.kernel.org/stable/c/1c48dc6a0c1ef47a9fa24611e60bc2f4ee4dd0df

https://git.kernel.org/stable/c/36ca587f55a2c04468a89fd16174bb2f78dc04ec

https://git.kernel.org/stable/c/424130169dc03b84ea604685409726d61bcec859

https://git.kernel.org/stable/c/cca649a23a5fc8aae536fc27a0546c67690a4078

https://git.kernel.org/stable/c/ccc3664679763d2d6f067c28729bdff627bb72d0

https://git.kernel.org/stable/c/e5be5d452d5f1efbb3342da2b00029be6c99034e

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