CVE ID:	CVE-2024-26832
Description:	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, and the folio is ref'd. Make sure to unlock and put the folio before returning. This was discovered by code inspection, probably because this path handles a race condition that should not happen often, and the bug would not crash the system, it will only strand the folio indefinitely.
Test IDs:	None available
Cross References:	Common Vulnerability Exposure (CVE) ID: CVE-2024-26832 https://git.kernel.org/stable/c/14f1992430ef9e647b02aa8ca12c5bcb9a1dffea https://git.kernel.org/stable/c/14f1992430ef9e647b02aa8ca12c5bcb9a1dffea https://git.kernel.org/stable/c/6156277d1b26cb3fdb6fcbf0686ab78268571644 https://git.kernel.org/stable/c/6156277d1b26cb3fdb6fcbf0686ab78268571644 https://git.kernel.org/stable/c/e2891c763aa2cff74dd6b5e978411ccf0cf94abe https://git.kernel.org/stable/c/e2891c763aa2cff74dd6b5e978411ccf0cf94abe https://git.kernel.org/stable/c/e3b63e966cac0bf78aaa1efede1827a252815a1d https://git.kernel.org/stable/c/e3b63e966cac0bf78aaa1efede1827a252815a1d