CVE-2021-46953 Information

Description

In the Linux kernel the following vulnerability has been resolved:

ACPI: GTDT: Don’t corrupt interrupt mappings on watchdow probe failure

When failing the driver probe because of invalid firmware properties the GTDT driver unmaps the interrupt that it mapped earlier.

However it never checks whether the mapping of the interrupt actially succeeded. Even more should the firmware report an illegal interrupt number that overlaps with the GIC SGI range this can result in an IPI being unmapped and subsequent fireworks (as reported by Dann Frazier).

Rework the driver to have a slightly saner behaviour and actually check whether the interrupt has been mapped before unmapping things.

Reference

https://git.kernel.org/stable/c/c3385a9122f8db15b453e07bfc88117fce7f3724 https://git.kernel.org/stable/c/7b2162db1498c71962a4bb2f776fa4e76d4d305b https://git.kernel.org/stable/c/504632a3577a049dd9bb7aabae5b4476f9c586b4 https://git.kernel.org/stable/c/e0f2d86481eaa83df33b0793f75212919db7a19d https://git.kernel.org/stable/c/42e69521ee1fa5abf21f478d147d06bbfe6bf6a8 https://git.kernel.org/stable/c/596e079c362ac17ed02aa1b99fdc444d62072a01 https://git.kernel.org/stable/c/1ecd5b129252249b9bc03d7645a7bda512747277