In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
f2fs: only redirty pinned folios in redirty_blocks<\/p>\n
redirty_blocks() pins folios with read_cache_folio() and then walks the
\nsame range again with filemap_lock_folio() to redirty them and drop the
\nreferences it took.<\/p>\n
Commit 5951fee46bef (“f2fs: Use a folio in redirty_blocks()”) changed
\nthe second pass to a do\/while loop. If read_cache_folio() fails before
\nanything is pinned, page_idx does not advance but the cleanup loop still
\nruns once.<\/p>\n
If readahead has already populated the failed folio in page cache, that
\nextra iteration finds it and folio_put_refs(folio, 2) drops one
\nreference too many. Later drop_caches or reclaim can then report
\n“BUG: Bad page state”.<\/p>\n
Only redirty the range that was pinned successfully.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
f2fs: only redirty pinned folios in redirty_blocks<\/p>\n
redirty_blocks() pins folios with read_cache_folio() and then walks the
\nsame ra<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-24528","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/24528","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln"}],"about":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/types\/vuln"}],"wp:attachment":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=24528"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=24528"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=24528"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}