res_rtp_asterisk: Fix crash when RTCP is not available during SSRC change

In r400089, a patch was put in to correct erroneous RTCP statistic resets.
Unfortunately, ast_rtp_read can be called on an RTP instance that does not
have RTCP information. This patch prevents that crash by only resetting
the statistics if we do actually have an RTCP instance.

(issue AST-1174)

(closes issue ASTERISK-22667)
Reported by: John Bigelow
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Merged revisions 401445 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 401446 from http://svn.asterisk.org/svn/asterisk/branches/11
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Merged revisions 401447 from http://svn.asterisk.org/svn/asterisk/branches/12

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@401450 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/res/res_rtp_asterisk.c b/res/res_rtp_asterisk.c
index e2a1056..bcb0b01 100644 (file)
--- a/res/res_rtp_asterisk.c
+++ b/res/res_rtp_asterisk.c
@@ -3699,10 +3699,12 @@ static struct ast_frame *ast_rtp_read(struct ast_rtp_instance *instance, int rtc
                rtp->rxcount = 0;
                rtp->cycles = 0;
                rtp->lastrxseqno = 0;
-               rtp->rtcp->expected_prior = 0;
-               rtp->rtcp->received_prior = 0;
                rtp->last_seqno = 0;
                rtp->last_end_timestamp = 0;
+               if (rtp->rtcp) {
+                       rtp->rtcp->expected_prior = 0;
+                       rtp->rtcp->received_prior = 0;
+               }
        }
 
        rtp->rxssrc = ssrc;