| |
Vulnerability CVE-2024-26832
Published: 2024-04-17
| 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. |
References: |
https://git.kernel.org/stable/c/14f1992430ef9e647b02aa8ca12c5bcb9a1dffea
https://git.kernel.org/stable/c/6156277d1b26cb3fdb6fcbf0686ab78268571644
https://git.kernel.org/stable/c/e2891c763aa2cff74dd6b5e978411ccf0cf94abe
https://git.kernel.org/stable/c/e3b63e966cac0bf78aaa1efede1827a252815a1d
|
|
|
Copyright 2024, cxsecurity.com
|
|
|
