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Description of problem:
After bringing down the main ethernet interface to test recovery and fencing, stonithd segfaulted on the node with the failed ethernet interface.

Version-Release number of selected component:
pacemaker-1.1.8-1.el7

Additional info:
libreport version: 2.0.12
abrt_version:   2.0.11
backtrace_rating: 4
cmdline:        /usr/libexec/pacemaker/stonithd
crash_function: strlen
kernel:         3.5.0-0.24.el7.x86_64

truncated backtrace:
:Thread no. 1 (9 frames)
: #0 strlen at ../sysdeps/x86_64/strlen.S
: #1 __strdup at strdup.c
: #2 create_remote_stonith_op at remote.c
: #3 initiate_remote_stonith_op at remote.c
: #4 stonith_command at commands.c
: #5 st_ipc_dispatch at main.c
: #6 _process_request_ at ipcs.c
: #7 qb_ipcs_dispatch_connection_request at ipcs.c
: #8 gio_read_socket at mainloop.c

Created attachment 608627 [details]
File: core_backtrace

Created attachment 608628 [details]
File: environ

Created attachment 608629 [details]
File: backtrace

Created attachment 608630 [details]
File: limits

Created attachment 608631 [details]
File: cgroup

Created attachment 608632 [details]
File: maps

Created attachment 608633 [details]
File: dso_list

Created attachment 608634 [details]
File: build_ids

Created attachment 608635 [details]
File: var_log_messages

Created attachment 608636 [details]
File: open_fds

A related patch has been committed upstream:
  https://github.com/beekhof/pacemaker/commit/85dfc9c

with subject:

   High: Fencing: Prevent use-of-NULL when fencing is initiated by stonith_admin

Further details (if any):