From: Jan Kara <jack@suse.cz> stable inclusion from stable-v5.10.246 commit 20863bb7fbb016379f8227122edfabc5c799bc79 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/ID4A7Q CVE: CVE-2025-40105 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... -------------------------------- [ Upstream commit 56094ad3eaa21e6621396cc33811d8f72847a834 ] When user calls open_by_handle_at() on some inode that is not cached, we will create disconnected dentry for it. If such dentry is a directory, exportfs_decode_fh_raw() will then try to connect this dentry to the dentry tree through reconnect_path(). It may happen for various reasons (such as corrupted fs or race with rename) that the call to lookup_one_unlocked() in reconnect_one() will fail to find the dentry we are trying to reconnect and instead create a new dentry under the parent. Now this dentry will not be marked as disconnected although the parent still may well be disconnected (at least in case this inconsistency happened because the fs is corrupted and .. doesn't point to the real parent directory). This creates inconsistency in disconnected flags but AFAICS it was mostly harmless. At least until commit f1ee616214cb ("VFS: don't keep disconnected dentries on d_anon") which removed adding of most disconnected dentries to sb->s_anon list. Thus after this commit cleanup of disconnected dentries implicitely relies on the fact that dput() will immediately reclaim such dentries. However when some leaf dentry isn't marked as disconnected, as in the scenario described above, the reclaim doesn't happen and the dentries are "leaked". Memory reclaim can eventually reclaim them but otherwise they stay in memory and if umount comes first, we hit infamous "Busy inodes after unmount" bug. Make sure all dentries created under a disconnected parent are marked as disconnected as well. Reported-by: syzbot+1d79ebe5383fc016cf07@syzkaller.appspotmail.com Fixes: f1ee616214cb ("VFS: don't keep disconnected dentries on d_anon") CC: stable@vger.kernel.org Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Christian Brauner <brauner@kernel.org> [ relocated DCACHE_DISCONNECTED propagation from d_alloc_parallel() to d_alloc() ] Signed-off-by: Sasha Levin <sashal@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Conflicts: fs/dcache.c [6a8c6793785d ("fs/dcache.c: avoid panic while lockref of dentry overflow") introduces conflicts, which does not affect this patch.] Signed-off-by: Zizhi Wo <wozizhi@huawei.com> --- fs/dcache.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/dcache.c b/fs/dcache.c index d36bb8fc2c41..a316a1b2e144 100644 --- a/fs/dcache.c +++ b/fs/dcache.c @@ -1884,6 +1884,8 @@ struct dentry *d_alloc(struct dentry * parent, const struct qstr *name) __dget_dlock(parent); dentry->d_parent = parent; list_add(&dentry->d_child, &parent->d_subdirs); + if (parent->d_flags & DCACHE_DISCONNECTED) + dentry->d_flags |= DCACHE_DISCONNECTED; spin_unlock(&parent->d_lock); out: return dentry; -- 2.39.2