Description of problem:

Keepalive segfaults when there is no IP value defined for unicast_src_ip option in keepalived.conf. No error message is logged


Version-Release number of selected component (if applicable):
keepalived-1.2.13-5.el6_6.x86_64


How reproducible:
Always


Steps to Reproduce:
1. Prepare basic keepalived configuration with unicast_src_ip option without value.
Example basic keepalived as follows:
vrrp_instance unify_lvs_service_private {
    priority 100
    advert_int 1
    authentication {
        auth_pass 1111
        auth_type PASS
    }
    state BACKUP
    unicast_peer {
    }
    unicast_src_ip
    interface eth1
    nopreempt
    virtual_ipaddress {
        192.168.10.3/24
    }
    virtual_router_id 52
}
vrrp_instance unify_lvs_service_public {
    priority 100
    advert_int 1
    authentication {
        auth_pass 1111
        auth_type PASS
    }
    unicast_peer {
        10.39.84.145
    }
    state BACKUP
    unicast_src_ip 10.39.84.150
    interface eth0
    nopreempt
    virtual_ipaddress {
        10.39.84.221/25
        10.39.84.220/25
    }
    virtual_router_id 51
}
vrrp_sync_group unify_lvs_service {
    group {
        unify_lvs_service_private
        unify_lvs_service_public
    }
    !group_name unify_lvs_service
}

2. start keepalived service
3. check /var/log messages for respawning child

Actual results:
Child respowning without providing any clue in /var/log/messages why.


Expected results:
Log in /var/log/messages providing information why parsing of keepalived.conf fails and child respawns


Additional info:

My reproducer shows following in /var/log/messages:
Jan 18 12:21:22 rhel6 Keepalived_vrrp[22726]: Netlink reflector reports IP 192.168.122.202 added
Jan 18 12:21:22 rhel6 Keepalived_vrrp[22726]: Netlink reflector reports IP fe80::5054:ff:fed7:7bf4 added
Jan 18 12:21:22 rhel6 Keepalived_vrrp[22726]: Netlink reflector reports IP fe80::5054:ff:feab:b9d9 added
Jan 18 12:21:22 rhel6 Keepalived_vrrp[22726]: Netlink reflector reports IP fe80::5054:ff:fe01:8bdf added
Jan 18 12:21:22 rhel6 Keepalived_vrrp[22726]: Registering Kernel netlink reflector
Jan 18 12:21:22 rhel6 Keepalived_vrrp[22726]: Registering Kernel netlink command channel
Jan 18 12:21:22 rhel6 Keepalived_vrrp[22726]: Registering gratuitous ARP shared channel
Jan 18 12:21:22 rhel6 Keepalived_vrrp[22726]: Opening file '/etc/keepalived/keepalived.conf'.


Related strace:
----
getuid()                                = 0
socket(PF_LOCAL, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 10
connect(10, {sa_family=AF_LOCAL, sun_path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
close(10)                               = 0
socket(PF_LOCAL, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 10
connect(10, {sa_family=AF_LOCAL, sun_path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
close(10)                               = 0
open("/etc/passwd", O_RDONLY|O_CLOEXEC) = 10
fstat(10, {st_mode=S_IFREG|0644, st_size=1865, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fb1a40a2000
read(10, "root:x:0:0:root:/root:/bin/bash\nbin:x:1:1:bin:/bin:/sbin/nologin\ndaemon:x:2:2:daemon:/sbin:/sbin/nologin\nadm:x:3:4:adm:/var/adm:/sbin/nologin\nlp:x:4:7:lp:/var/spool/lpd:/sbin/nologin\nsync:x:5:0:sync:/sbin:/bin/sync\nshutdown:x:6:0:shutdown:/sbin:/sbin/shutd"..., 4096) = 1865
close(10)                               = 0
munmap(0x7fb1a40a2000, 4096)            = 0
stat("/etc/keepalived/keepalived.conf", {st_mode=S_IFREG|0644, st_size=862, ...}) = 0
gettimeofday({1453116082, 925966}, NULL) = 0
sendto(3, "<142>Jan 18 12:21:22 Keepalived_vrrp[22726]: Opening file '/etc/keepalived/keepalived.conf'.", 92, MSG_NOSIGNAL, NULL, 0) = 92
open("/etc/keepalived/keepalived.conf", O_RDONLY) = 10
getcwd("/", 1024)                       = 2
chdir("/etc/keepalived")                = 0
fstat(10, {st_mode=S_IFREG|0644, st_size=862, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fb1a40a2000
read(10, "vrrp_instance unify_lvs_service_private {\n    priority 100\n    advert_int 1\n    authentication {\n        auth_pass 1111\n        auth_type PASS\n    }\n    state BACKUP\n    unicast_peer {\n    }\n    unicast_src_ip\n    interface eth1\n    nopreempt\n    virtual_i"..., 4096) = 862
--- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=0x70695f637270} ---
+++ killed by SIGSEGV (core dumped) +++