CVE-2024-35843

In the Linux kernel, the following vulnerability has been resolved:
iommu/vt-d: Use device rbtree in iopf reporting path The existing I/O page
fault handler currently locates the PCI device by calling
pci_get_domain_bus_and_slot(). This function searches the list of all PCI
devices until the desired device is found. To improve lookup efficiency,
replace it with device_rbtree_find() to search the device within the probed
device rbtree. The I/O page fault is initiated by the device, which does
not have any synchronization mechanism with the software to ensure that the
device stays in the probed device tree. Theoretically, a device could be
released by the IOMMU subsystem after device_rbtree_find() and before
iopf_get_dev_fault_param(), which would cause a use-after-free problem. Add
a mutex to synchronize the I/O page fault reporting path and the IOMMU
release device path. This lock doesn’t introduce any performance overhead,
as the conflict between I/O page fault reporting and device releasing is
very rare.