pci/hotplug/pnv_php: Fix hotplug driver crash on Powernv
3Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackepss 0.3%
exploitation probability
0.3%top 85% of all CVEs
observed exploitation
nono source reports it
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.
Affected products
Linux · LinuxReferences
https://git.kernel.org/stable/c/335e35b748527f0c06ded9eebb65387f60647fdahttps://git.kernel.org/stable/c/438d522227374042b5c8798f8ce83bbe479dca4dhttps://git.kernel.org/stable/c/4eb4085c1346d19d4a05c55246eb93e74e671048https://git.kernel.org/stable/c/b82d4d5c736f4fd2ed224c35f554f50d1953d21ehttps://git.kernel.org/stable/c/bc1faed19db95abf0933b104910a3fb01b138f59https://git.kernel.org/stable/c/bfc44075b19740d372f989f21dd03168bfda0689https://git.kernel.org/stable/c/c0d8094dc740cfacf3775bbc6a1c4720459e8de4https://git.kernel.org/stable/c/c4c681999d385e28f84808bbf3a85ea8e982da55https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html