CVE-2022-49711 — bus: fsl-mc-bus: fix KASAN use-after-free in fsl_mc_bus_remove()

Affected: Linux

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

bus: fsl-mc-bus: fix KASAN use-after-free in fsl_mc_bus_remove()

In fsl_mc_bus_remove(), mc->root_mc_bus_dev->mc_io is passed to fsl_destroy_mc_io(). However, mc->root_mc_bus_dev is already freed in fsl_mc_device_remove(). Then reference to mc->root_mc_bus_dev->mc_io triggers KASAN use-after-free. To avoid the use-after-free, keep the reference to mc->root_mc_bus_dev->mc_io in a local variable and pass to fsl_destroy_mc_io().

This patch needs rework to apply to kernels older than v5.15.

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CVE-2022-49711 — bus: fsl-mc-bus: fix KASAN use-after-free in fsl_mc_bus_remove()