https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217760
Bug ID: 217760
Summary: [patch] [bsnmpd] bsnmpd coredumps on first request
Product: Base System
Version: 11.0-STABLE
Hardware: Any
OS: Any
Status: New
Keywords: patch
Severity: Affects Some People
Priority: ---
Component: bin
Assignee: freebsd-bugs@FreeBSD.org
Reporter: eu...@freebsd.org
Keywords: patch
Created attachment 180780
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=180780&action=edit
properly initialize port->transport
One of my 11.0-STABLE systems starts bsnmpd just fine but first request crashes
it with sigsegv and core is generated.
#0 snmpd_input (pi=0x2861ce98, tport=0x2861cc80) at
/home/src/usr.sbin/bsnmpd/bsnmpd/../../../contrib/bsnmp/snmpd/main.c:1044
1044 ret = tport->transport->vtab->recv(tport, pi);
(gdb) bt
#0 snmpd_input (pi=0x2861ce98, tport=0x2861cc80) at
/home/src/usr.sbin/bsnmpd/bsnmpd/../../../contrib/bsnmp/snmpd/main.c:1044
#1 0x0805f36c in udp_input (fd=8, udata=0x2861cc80) at
/home/src/usr.sbin/bsnmpd/bsnmpd/../../../contrib/bsnmp/snmpd/trans_udp.c:98
#2 0x0804e116 in input (fd=8, mask=1, uap=0x28621080) at
/home/src/usr.sbin/bsnmpd/bsnmpd/../../../contrib/bsnmp/snmpd/main.c:900
#3 0x2809b9a7 in poll_dispatch (wait=1) at
/home/src/contrib/libbegemot/rpoll.c:614
#4 0x0804f9c5 in main (argc=0, argv=0xbfbfee78) at
/home/src/usr.sbin/bsnmpd/bsnmpd/../../../contrib/bsnmp/snmpd/main.c:1714
Current language: auto; currently minimal
(gdb) p tport->transport
$1 = (struct transport *) 0x0
On line patch fixing the problem is attached. The problem manifests when
bsnmpd.conf has several begemotSnmpdPortStatus.* lines for distinct IP
addresses and addresses are unsorted, for example:
# open standard SNMP ports
#begemotSnmpdPortStatus.0.0.0.0.161 = 1
begemotSnmpdPortStatus.[192.168.1.6].161 = 1
begemotSnmpdPortStatus.127.0.0.1.161 = 1
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