Description: libsnmp: Increase the maximum SNMPv3 session receive size 
or the UDP transport this patch increases the maximum message size from 1472
to about 64 KB.

This patch adjusts a limit that was introduced by commit 6e83b3c
("respect msgMaxSize in received v3 PDUs (in the weak sense that if the
serialized response PDU is more than it, we don't send it)") # v5.7.

---
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Origin: <vendor|upstream|other>, <url of original patch>
Bug: <url in upstream bugtracker>
Bug-Debian: https://bugs.debian.org/<bugnumber>
Bug-Ubuntu: https://launchpad.net/bugs/<bugnumber>
Forwarded: <no|not-needed|url proving that it has been forwarded>
Reviewed-By: <name and email of someone who approved the patch>
Last-Update: 2021-02-03

--- net-snmp-5.8+dfsg.orig/snmplib/snmp_api.c
+++ net-snmp-5.8+dfsg/snmplib/snmp_api.c
@@ -768,7 +768,7 @@ snmp_sess_init(netsnmp_session * session
     session->retries = SNMP_DEFAULT_RETRIES;
     session->version = SNMP_DEFAULT_VERSION;
     session->securityModel = SNMP_DEFAULT_SECMODEL;
-    session->rcvMsgMaxSize = SNMP_MAX_MSG_SIZE;
+    session->rcvMsgMaxSize = netsnmp_max_send_msg_size();
     session->sndMsgMaxSize = netsnmp_max_send_msg_size();
     session->flags |= SNMP_FLAGS_DONT_PROBE;
 }