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Change History

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

mm: zswap: fix missing folio cleanup in writeback race path

In zswap_writeback_entry(), after we get a folio from
__read_swap_cache_async(), we grab the tree lock again to check that the
swap entry was not invalidated and recycled.  If it was, we delete the
folio we just added to the swap cache and exit.

However, __read_swap_cache_async() returns the folio locked when it is
newly allocated, which is always true for this path,

kernel.org https://git.kernel.org/stable/c/14f1992430ef9e647b02aa8ca12c5bcb9a1dffea [No types assigned]

kernel.org https://git.kernel.org/stable/c/6156277d1b26cb3fdb6fcbf0686ab78268571644 [No types assigned]

kernel.org https://git.kernel.org/stable/c/e2891c763aa2cff74dd6b5e978411ccf0cf94abe [No types assigned]

kernel.org https://git.kernel.org/stable/c/e3b63e966cac0bf78aaa1efede1827a252815a1d [No types assigned]