Patch is now available at upstream:
[lhh@ayanami ~]$ echo power_wait | fence_ipmilan
Segmentation fault (core dumped)
[lhh@ayanami ipmilan]$ echo power_wait | ./fence_ipmilan
failed: no IP address specified
Very simple test, and the upstream patch fixes the problem.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.