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;
}
.......
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;
}
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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