Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: f2fs: only redirty pinned folios in redirty_blocks redirty_blocks() pins folios with read_cache_folio() and then walks the same range again with filemap_lock_folio() to redirty them and drop the references it took. Commit 5951fee46bef ("f2fs: Use a folio in redirty_blocks()") changed the second pass to a do/while loop. If read_cache_folio() fails before anything is pinned, page_idx does not advance but the cleanup loop still runs once. If readahead has already populated the failed folio in page cache, that extra iteration finds it and folio_put_refs(folio, 2) drops one reference too many. Later drop_caches or reclaim can then report "BUG: Bad page state". Only redirty the range that was pinned successfully.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 5951fee46befbf6176c86482432f4f76e522f16c before 445e4a1e6025ecd5312e9a95c1b234192c976ca1; affected 5951fee46befbf6176c86482432f4f76e522f16c before 89c65ec3c18903de763cf567c96ab3ef60e5f3b0; affected 5951fee46befbf6176c86482432f4f76e522f16c before 85171332742e741ccd6f401c69b6e0d698119e72 |
| Linux / Linux | affected 6.16; unaffected 0 before 6.16; unaffected 6.18.51 through 6.18.*; unaffected 7.2.5 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.