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Howlett" , "Vlastimil Babka" , "Mike Rapoport" , "Suren Baghdasaryan" , "Michal Hocko" , "Kees Cook" , "Peter Zijlstra" , "Jann Horn" , "Pedro Falcato" , "Hugh Dickins" , "Pasha Tatashin" , "Pratyush Yadav" , "Matthew Wilcox (Oracle)" , "Jan Kara" , "Lance Yang" , "Rik van Riel" , "Harry Yoo" , "Alistair Popple" , "Nico Pache" , "Ryan Roberts" , "Dev Jain" , "Usama Arif" , "Kiryl Shutsemau" , "Matthew Brost" , "John Hubbard" , "Peter Xu" , "Will Deacon" , "Aneesh Kumar K.V" , "Nick Piggin" , "Oscar Salvador" , "Minchan Kim" , "Muchun Song" , "Xu Xin" , "Chengming Zhou" , "Chris Li" , "Kemeng Shi" , "Nhat Pham" , "Youngjun Park" , "Gregory Price" , "Joshua Hahn" , "Rakie Kim" , "Ying Huang" , "Jason Gunthorpe" From: "Zi Yan" X-Mailer: aerc 0.22.0 References: <20261029-fixes_core-v2-0-a64ce7f83abb@kernel.org> <20261029-fixes_core-v2-6-a64ce7f83abb@kernel.org> In-Reply-To: <20261029-fixes_core-v2-6-a64ce7f83abb@kernel.org> X-ClientProxiedBy: BL1PR13CA0167.namprd13.prod.outlook.com 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 On Thu Oct 29, 2026 at 4:33 PM EDT, David Hildenbrand (Arm) wrote: > From: Josef Bacik > > memory_failure() -> ... -> filemap_remove_folio() can read mapping->a_ops > after the inode has been freed. Once the folio is deleted from the > pagecache it no longer pins the mapping, so after i_lock is dropped > e.g., a concurrent final iput() can evict and free the inode before > filemap_free_folio() looks up mapping->a_ops->free_folio. > > Most callers hold a reference on the inode, but not all. > > Documentation/filesystems/vfs.rst explicitly states that ->free_folio() > must not assume the original address_space mapping still exists. > > Fix it by loading ->free_folio while i_lock is still held, similar to > what folio_unmap_invalidate() does. > > Inline filemap_free_folio() into its remaining caller such that > delete_from_page_cache_batch() also just loads the callback before > dropping the i_lock. > > The bug was found by code inspection and has not been reproduced. > > Fix generated by an LLM and sent by Josef Bacik in private. > > Fixes: 59c66c5f8c4f ("mm: factor out page cache page freeing into a separ= ate function") > Cc: stable@vger.kernel.org > Signed-off-by: Josef Bacik > [ david: get rid of filemap_free_folio() entirely; improve patch descript= ion ] > Reviewed-by: Rik van Riel > Signed-off-by: David Hildenbrand (Arm) > --- > mm/filemap.c | 29 ++++++++++++++--------------- > 1 file changed, 14 insertions(+), 15 deletions(-) > Makes sense. Reviewed-by: Zi Yan --=20 Best Regards, Yan, Zi