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Change History

In the Linux kernel, the following vulnerability has been resolved:

mm: call ->free_folio() directly in folio_unmap_invalidate()

We can only call filemap_free_folio() if we have a reference to (or hold a
lock on) the mapping.  Otherwise, we've already removed the folio from the
mapping so it no longer pins the mapping and the mapping can be removed,
causing a use-after-free when accessing mapping->a_ops.

Follow the same pattern as __remove_mapping() and load the free_folio
function pointer before dropping the lock on the mapping.  That lets us
make filemap_free_folio() static as this was the only caller outside
filemap.c.

https://git.kernel.org/stable/c/b667df39d98a7a24be7c2a40ff0863dac1ad2cd7

https://git.kernel.org/stable/c/c330e65ea59c4805d6ab6757c4ddfe8c63acef31