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| author | Zhihao Cheng <chengzhihao1@huawei.com> | 2022-10-11 06:47:31 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-03-11 18:44:09 +0300 |
| commit | 82c096d0c99af5171dc5f3373511ad3bd368d756 (patch) | |
| tree | cc231b655c07af5b929833d83c4c1300587fab3a /fs | |
| parent | bf8f5495849d8944378501b36b0cc8f98dc50c78 (diff) | |
| download | linux-82c096d0c99af5171dc5f3373511ad3bd368d756.tar.xz | |
ubifs: do_rename: Fix wrong space budget when target inode's nlink > 1
[ Upstream commit 25fce616a61fc2f1821e4a9ce212d0e064707093 ]
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>
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/ubifs/dir.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/ubifs/dir.c b/fs/ubifs/dir.c index 9a4f9563acee..332c0b02a0ad 100644 --- a/fs/ubifs/dir.c +++ b/fs/ubifs/dir.c @@ -1296,6 +1296,8 @@ 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; |