[ECOS] SNMP GETBULK leaks 50k per request -- security issue

[Tad]

A GETBULK request requiring > 8k bytes in the response 
(snmp_api.c:PACKET_LENGTH or sendto max)
forgets to free the 50k pdu malloc'ed.

Should be able to crash any ecos snmp system with a couple:
bulkget -Cr50 -v 2c -c public 192.168.1.199 system system system system 
system icmp system icmp
which will eat 5 retries x50k at a time

Basically, the snmp_agent.c we're using is POS full of memory leaks if 
snmp_send or other errors occur.

I grabbed the latest v4.2 branch from SF of snmp_agent.c, snmp_agent.h, 
and snmp_api.h which seem to compile for ecos with virtually no changes 
(used the ECOS includes for snmp_agent.c)

The latest snmp_agent.c seems to do a nice job of cleaning up memory and 
has a slightly faster SET operation.

http://net-snmp.cvs.sourceforge.net/net-snmp/net-snmp/agent/snmp_agent.c?view=log&r1=1.100&pathrev=V4-2-patches
et. al.

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