From c5566903af56dd1abb092f18dcb0c770d6cd8dcb Mon Sep 17 00:00:00 2001 From: Jan Kara Date: Tue, 26 Nov 2024 12:46:00 +0100 Subject: [PATCH] udf: Skip parent dir link count update if corrupted If the parent directory link count is too low (likely directory inode corruption), just skip updating its link count as if it goes to 0 too early it can cause unexpected issues. Signed-off-by: Jan Kara --- fs/udf/namei.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/fs/udf/namei.c b/fs/udf/namei.c index 78a603129dd5..2be775d30ac1 100644 --- a/fs/udf/namei.c +++ b/fs/udf/namei.c @@ -517,7 +517,11 @@ static int udf_rmdir(struct inode *dir, struct dentry *dentry) inode->i_nlink); clear_nlink(inode); inode->i_size = 0; - inode_dec_link_count(dir); + if (dir->i_nlink >= 3) + inode_dec_link_count(dir); + else + udf_warn(inode->i_sb, "parent dir link count too low (%u)\n", + dir->i_nlink); udf_add_fid_counter(dir->i_sb, true, -1); inode_set_mtime_to_ts(dir, inode_set_ctime_to_ts(dir, inode_set_ctime_current(inode)));