commit 41e192ad2779cae0102879612dfe46726e4396aa upstream. Syzbot reported that in directory operations after nilfs2 detects filesystem corruption and degrades to read-only, __block_write_begin_int(), which is called to prepare block writes, may fail the BUG_ON check for accesses exceeding the folio/page size, triggering a kernel bug. This was found to be because the "checked" flag of a page/folio was not cleared when it was discarded by nilfs2's own routine, which causes the sanity check of directory entries to be skipped when the directory page/folio is reloaded. So, fix that. This was necessary when the use of nilfs2's own page discard routine was applied to more than just metadata files. Link: https://lkml.kernel.org/r/20241017193359.5051-1-konishi.ryusuke@xxxxxxxxx Fixes: 8c26c4e2694a ("nilfs2: fix issue with flush kernel thread after remount in RO mode because of driver's internal error or metadata corruption") Signed-off-by: Ryusuke Konishi <konishi.ryusuke@xxxxxxxxx> Reported-by: syzbot+d6ca2daf692c7a82f959@xxxxxxxxxxxxxxxxxxxxxxxxx Closes: https://syzkaller.appspot.com/bug?extid=d6ca2daf692c7a82f959 Cc: <stable@xxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- Please apply this patch to the stable trees indicated by the subject prefix instead of the failed patches. This patch is tailored to take page/folio conversion into account. Compiled and tested successfully. Thanks, Ryusuke Konishi fs/nilfs2/page.c | 1 + 1 file changed, 1 insertion(+) diff --git a/fs/nilfs2/page.c b/fs/nilfs2/page.c index 36d29c183bb7..956c90700e15 100644 --- a/fs/nilfs2/page.c +++ b/fs/nilfs2/page.c @@ -405,6 +405,7 @@ void nilfs_clear_dirty_page(struct page *page, bool silent) ClearPageUptodate(page); ClearPageMappedToDisk(page); + ClearPageChecked(page); if (page_has_buffers(page)) { struct buffer_head *bh, *head; -- 2.43.5
