res_pjsip: Prevent crashes when PJPROJECT presents an rdata with no message
When a message that exceeds the PJ_MAX_PKT_SIZE is sent over a reliable
transport, it is possible (although it shouldn't occur) for pjproject to pass
up an rdata object with a NULL msg in the msg_info. Needless to say, things
that attempt to dereference this are in for a rough ride.
In particular, this caused crashes in three different locations, all of which
are 'low level' enough to intercept an rdata object early in processing:
(1) res_pjsip_logger
(2) res_hep_pjsip
(3) res_pjsip/distributor
Anything that can intercept an rdata object before res_pjsip/distributor should
be defensive when looking at the received packet.
#SIPit31
ASTERISK-24369 #close
Reported by: Matt Jordan
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Merged revisions 424618 from http://svn.asterisk.org/svn/asterisk/branches/12
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Merged revisions 424619 from http://svn.asterisk.org/svn/asterisk/branches/13
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@424620
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