tree aca4b57eb1982d2cd21bcaa0cbabc45500f97026
parent 967ac8af4475ce45474800709b12137aa7634c77
author Andreas Dilger <adilger@dilger.ca> 1338238945 -0400
committer Theodore Ts'o <tytso@mit.edu> 1338238945 -0400

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: Andreas Dilger <adilger@dilger.ca>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: stable@kernel.org