In the Linux kernel, the following vulnerability has been resolved:
drm/nouveau/dmem: fix mismatched DMA unmap size for large folios
Device-private THP migration maps migration buffers with page_size()
and records that length in dma_info->size. For a compound folio
page_size() is PAGE_SIZE < 0 folio this unmaps less than was mapped, leaking the
remainder of the IOMMU/IOVA mapping. The other unmap sites, in
nouveau_dmem_migrate_chunk() and nouveau_dmem_evict_chunk(), already
use the saved size; use it here too.
