Messages in this thread Patch in this message | | | From | Zhihao Cheng <> | Subject | [PATCH 5/6] ubifs: do_rename: Fix wrong space budget when target inode's nlink > 1 | Date | Tue, 11 Oct 2022 11:47:31 +0800 |
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If target inode is a special file (eg. block/char device) with nlink count greater than 1, the inode with ui->data will be re-written on disk. However, UBIFS losts target inode's data_len while doing space budget. Bad space budget may let make_reservation() return with -ENOSPC, which could turn ubifs to read-only mode in do_writepage() process.
Fetch a reproducer in [Link].
Link: https://bugzilla.kernel.org/show_bug.cgi?id=216494 Fixes: 1e51764a3c2ac0 ("UBIFS: add new flash file system") Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com> --- fs/ubifs/dir.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/fs/ubifs/dir.c b/fs/ubifs/dir.c index 53c5442f48b7..a77e859246c3 100644 --- a/fs/ubifs/dir.c +++ b/fs/ubifs/dir.c @@ -1323,6 +1323,8 @@ static int do_rename(struct inode *old_dir, struct dentry *old_dentry, if (unlink) { ubifs_assert(c, inode_is_locked(new_inode)); + /* Budget for old inode's data when its nlink > 1. */ + req.dirtied_ino_d = ALIGN(ubifs_inode(new_inode)->data_len, 8); err = ubifs_purge_xattrs(new_inode); if (err) return err; -- 2.31.1
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