SubAgent crash in net-snmp-5.2.2

Hello list, 
 
We are using NET-SNMP-5.2.2 in subagent code.  We saw subagent crashed
when agent is crashed.  Reason seems to be that, in _sess_read(),
FD_ISSET() is crashed.  
Following is the code snippet: 
 
file: net-snmp-5.2.2/snmplib/snmp_api.c 
_sess_read()
{ 
.........
........
    if (!fdset || !(FD_ISSET(transport->sock, fdset))) {
=============> Crash
        DEBUGMSGTL(("sess_read", "not reading %d (fdset %p set %d)\n",
                    transport->sock, fdset,
                    fdset ? FD_ISSET(transport->sock, fdset) : -9));
        return 0;
    }
.......
.......
.......
}
 
We found that transport->sock value is -1 (0xFFFFFFFF). 
 
Can we modify the check as follows?  Will it have any other impact? 
_sess_read()
{
...........
..........
.........
 
if (transport->sock != -1)         ===============> Check to prevent the
crash 
{
    if (!fdset || !(FD_ISSET(transport->sock, fdset))) {
=============> Crash
        DEBUGMSGTL(("sess_read", "not reading %d (fdset %p set %d)\n",
                    transport->sock, fdset,
                    fdset ? FD_ISSET(transport->sock, fdset) : -9));
        return 0;
    }
}
.....
.....
.....
} /* _sess_read() */
 
Please help us. 
 
Regards
Mahesh

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