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| author | Ryusuke Konishi <konishi.ryusuke@gmail.com> | 2024-10-18 04:33:10 +0900 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-11-08 16:28:27 +0100 |
| commit | f2f1fa446676c21edb777e6d2bc4fa8f956fab68 (patch) | |
| tree | 7a1705059482623ecc3c706256e72d4b7f1e28c0 /fs | |
| parent | a53c2d847627b790fb3bd8b00e02c247941b17e0 (diff) | |
| download | linux-f2f1fa446676c21edb777e6d2bc4fa8f956fab68.tar.gz linux-f2f1fa446676c21edb777e6d2bc4fa8f956fab68.tar.bz2 linux-f2f1fa446676c21edb777e6d2bc4fa8f956fab68.zip | |
nilfs2: fix kernel bug due to missing clearing of checked flag
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@gmail.com
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@gmail.com>
Reported-by: syzbot+d6ca2daf692c7a82f959@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=d6ca2daf692c7a82f959
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/nilfs2/page.c | 1 |
1 files changed, 1 insertions, 0 deletions
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; |