Vulnerability CVE-2024-46761
Published: 2024-09-18

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

pci/hotplug/pnv_php: Fix hotplug driver crash on Powernv

The hotplug driver for powerpc (pci/hotplug/pnv_php.c) causes a kernel
crash when we try to hot-unplug/disable the PCIe switch/bridge from
the PHB.

The crash occurs because although the MSI data structure has been
released during disable/hot-unplug path and it has been assigned
with NULL, still during unregistration the code was again trying to
explicitly disable the MSI which causes the NULL pointer dereference and
kernel crash.

The patch fixes the check during unregistration path to prevent invoking
pci_disable_msi/msix() since its data structure is already freed.

 References:
https://git.kernel.org/stable/c/4eb4085c1346d19d4a05c55246eb93e74e671048
https://git.kernel.org/stable/c/c4c681999d385e28f84808bbf3a85ea8e982da55
https://git.kernel.org/stable/c/bc1faed19db95abf0933b104910a3fb01b138f59
https://git.kernel.org/stable/c/c0d8094dc740cfacf3775bbc6a1c4720459e8de4
https://git.kernel.org/stable/c/438d522227374042b5c8798f8ce83bbe479dca4d
https://git.kernel.org/stable/c/b82d4d5c736f4fd2ed224c35f554f50d1953d21e
https://git.kernel.org/stable/c/bfc44075b19740d372f989f21dd03168bfda0689
https://git.kernel.org/stable/c/335e35b748527f0c06ded9eebb65387f60647fda
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