Commit 7e936b73 authored by Andreas Dilger's avatar Andreas Dilger Committed by Theodore Ts'o
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ext4: disallow hard-linked directory in ext4_lookup

A hard-linked directory to its parent can cause the VFS to deadlock,
and is a sign of a corrupted file system.  So detect this case in
ext4_lookup(), before the rmdir() lockup scenario can take place.
Signed-off-by: default avatarAndreas Dilger <>
Signed-off-by: default avatar"Theodore Ts'o" <>
parent 967ac8af
......@@ -1330,6 +1330,12 @@ static struct dentry *ext4_lookup(struct inode *dir, struct dentry *dentry, stru
EXT4_ERROR_INODE(dir, "bad inode number: %u", ino);
return ERR_PTR(-EIO);
if (unlikely(ino == dir->i_ino)) {
EXT4_ERROR_INODE(dir, "'%.*s' linked to parent dir",
return ERR_PTR(-EIO);
inode = ext4_iget(dir->i_sb, ino);
if (inode == ERR_PTR(-ESTALE)) {
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