[Asterisk-code-review] res_rtp_asterisk: Resolve loop when receive buffer is flushed (asterisk[17])

[Friendly Automation]

Friendly Automation has submitted this change. ( https://gerrit.asterisk.org/c/asterisk/+/14235 )

Change subject: res_rtp_asterisk: Resolve loop when receive buffer is flushed
......................................................................

res_rtp_asterisk: Resolve loop when receive buffer is flushed

When the receive buffer was flushed by a received packet while it
already contained a packet with the same sequence number, Asterisk
never left the while loop which tried to order the packets.

This change makes it so if the packet is in the receive buffer it
is retrieved and freed allowing the buffer to empty.

ASTERISK-28827

Change-Id: Idaa376101bc1ac880047c49feb6faee773e718b3
---
M res/res_rtp_asterisk.c
1 file changed, 8 insertions(+), 0 deletions(-)

Approvals:
  Joshua Colp: Looks good to me, approved
  Benjamin Keith Ford: Looks good to me, but someone else must approve
  George Joseph: Looks good to me, but someone else must approve
  Friendly Automation: Approved for Submit



diff --git a/res/res_rtp_asterisk.c b/res/res_rtp_asterisk.c
index 5dd5d35..75be561 100644
--- a/res/res_rtp_asterisk.c
+++ b/res/res_rtp_asterisk.c
@@ -7835,6 +7835,14 @@
 					ast_debug(2, "Inserted just received packet with sequence number '%d' in correct order on RTP instance '%p'\n",
 						seqno, instance);
 				}
+				/* It is possible due to packet retransmission for this packet to also exist in the receive
+				 * buffer so we explicitly remove it in case this occurs, otherwise the receive buffer will
+				 * never be empty.
+				 */
+				payload = (struct ast_rtp_rtcp_nack_payload *)ast_data_buffer_remove(rtp->recv_buffer, seqno);
+				if (payload) {
+					ast_free(payload);
+				}
 				rtp->expectedrxseqno++;
 				if (rtp->expectedrxseqno == SEQNO_CYCLE_OVER) {
 					rtp->expectedrxseqno = 0;

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Gerrit-Project: asterisk
Gerrit-Branch: 17
Gerrit-Change-Id: Idaa376101bc1ac880047c49feb6faee773e718b3
Gerrit-Change-Number: 14235
Gerrit-PatchSet: 3
Gerrit-Owner: Joshua Colp <jcolp at sangoma.com>
Gerrit-Reviewer: Benjamin Keith Ford <bford at digium.com>
Gerrit-Reviewer: Friendly Automation
Gerrit-Reviewer: George Joseph <gjoseph at digium.com>
Gerrit-Reviewer: Joshua Colp <jcolp at sangoma.com>
Gerrit-Reviewer: nappsoft <infos at nappsoft.ch>
Gerrit-MessageType: merged
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