CVE-2024-26832
Assigner: Linux
Published: 2024-04-17T10:10:01.016Z
State: PUBLISHED
descriptions: value: 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.
affected: product: Linux
vendor: Linux
defaultStatus: unaffected
repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
versions: version: 2cab13f500a6
lessThan: 14f1992430ef
status: affected
versionType: git
version: 04fc7816089c
lessThan: 6156277d1b26
status: affected
versionType: git
version: 04fc7816089c
lessThan: e2891c763aa2
status: affected
versionType: git
version: 04fc7816089c
lessThan: e3b63e966cac
status: affected
versionType: git
product: Linux
vendor: Linux
defaultStatus: affected
repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
versions: version: 6.4
status: affected
version: 0
lessThan: 6.4
status: unaffected
versionType: custom
version: 6.1.80
lessThanOrEqual: 6.1.*
status: unaffected
versionType: custom
version: 6.6.19
lessThanOrEqual: 6.6.*
status: unaffected
versionType: custom
version: 6.7.7
lessThanOrEqual: 6.7.*
status: unaffected
versionType: custom
version: 6.8
lessThanOrEqual: *
status: unaffected
versionType: original_commit_for_fix
title: mm: zswap: fix missing folio cleanup in writeback race path
x_generator: engine: bippy-d175d3acf727