Received from OpenBSD via US-CERT as VU #590371.
Original OpenBSD commit log:
> revision 1.42
> date: 2009/02/11 13:24:05; author: otto; state: Exp; lines: +9 -1
> Avoid level going negative on deep (i mean really deep) dirs. Reported
> by Maksymilian Arciemowicz. ok kettenis@ millert@