In the Linux kernel, the following vulnerability has been resolved:
PCI: dwc: Avoid dwc_pcie_rasdes_debugfs_deinit() NULL dereference when no RAS DES capability
dwc_pcie_rasdes_debugfs_init() returns success when the controller has no
RAS DES capability, leaving pci->debugfs->rasdes_info unset. The common
debugfs teardown path still calls dwc_pcie_rasdes_debugfs_deinit(), which
dereferences rasdes_info unconditionally. Return early when no RAS DES state was allocated.
In that case no RAS DES mutex was initialized, so there is nothing to destroy. [mani: reworded subject]
References 3
https://git.kernel.org/stable/c/26b67fa10ef84ea667942491b50e6261a45f098d
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/514b84b1bf30f75f32c2fa66734dc1a177abb73e
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/855870e8c59b97fd424e8fa3543c9e289bb48fac
416baaa9-dc9f-4396-8d5f-8c081fb06d67