[btrfs] is vulnerable to a hash-DoS attack

Hello folk,

The btrfs file system, part of the linux kernel, is vulnerable to a
trivial hash-DoS attack. More details can be found here:

http://crypto.junod.info/2012/12/13/hash-dos-and-btrfs/

Enjoy!

Pascal Junod

http://crypto.junod.info
@cryptopathe