From b41d730552840397262294657a2ad8de82aaebd2 Mon Sep 17 00:00:00 2001 From: Jan Kara Date: Tue, 26 Nov 2024 12:55:12 +0100 Subject: [PATCH] udf: Verify inode link counts before performing rename [ Upstream commit 6756af923e06aa33ad8894aaecbf9060953ba00f ] During rename, we are updating link counts of various inodes either when rename deletes target or when moving directory across directories. Verify involved link counts are sane so that we don't trip warnings in VFS. Reported-by: syzbot+3ff7365dc04a6bcafa66@syzkaller.appspotmail.com Signed-off-by: Jan Kara Signed-off-by: Sasha Levin --- fs/udf/namei.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/fs/udf/namei.c b/fs/udf/namei.c index 0461a7b1e9b4..8ac73f41d6eb 100644 --- a/fs/udf/namei.c +++ b/fs/udf/namei.c @@ -792,8 +792,18 @@ static int udf_rename(struct mnt_idmap *idmap, struct inode *old_dir, retval = -ENOTEMPTY; if (!empty_dir(new_inode)) goto out_oiter; + retval = -EFSCORRUPTED; + if (new_inode->i_nlink != 2) + goto out_oiter; } + retval = -EFSCORRUPTED; + if (old_dir->i_nlink < 3) + goto out_oiter; is_dir = true; + } else if (new_inode) { + retval = -EFSCORRUPTED; + if (new_inode->i_nlink < 1) + goto out_oiter; } if (is_dir && old_dir != new_dir) { retval = udf_fiiter_find_entry(old_inode, &dotdot_name,