CVE-2023-52455 iommu: Don't reserve 0-length IOVA region

In the Linux kernel, the following vulnerability has been resolved: iommu: Don't reserve 0-length IOVA region When the bootloader/firmware doesn't setup the framebuffers, their address and size are 0 in "iommu-addresses" property. If IOVA region is reserved with 0 length, then it ends up corrupti...

CVE-2023-52455

Mode C: CVE-2023-52455 relates to the Linux kernel IOMMU handling where a 0-length IOVA region in the iommu-addresses property could lead to IOVA rbtree corruption and display IOMMU mapping failures when framebuffer is absent. The documented fix adds a kernel check to skip IOVA reservation when t...