#2026 segmentation fault in python bindings on null session
Hi,
I was able to reproduce a bug affecting python bindings.
When creating a snmpv3 session towards an _unreachable_ host libsnmp-python caused a segfault when calling the get method.
It stores a null pointer as session pointer, and that is passed onwards to the snmpget code.
Actually this issue can be skipped in python by checking:
if sess.sess_ptr != 0:
...
but probably it would make sense to avoid creating the session object at all (so in the Session class contructor in python/netsnmp/client.py by raising an exception).
code to reproduce the issue:
import netsnmp
myvars = netsnmp.VarList(netsnmp.Varbind('.1.3.6.1.2.1.1.5.0', iid = ''))
sess = netsnmp.Session(Version = 3,SecLevel = 'noAuthPriv' , DestHost = '10.101.101.1', SecName= 'fake_user', Retries = 1, Timeout = 5 * 1000000)
res = sess.get(myvars)
Regards,
Gabriele Messineo
gabriele.messineo@winext.eu