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pjsip show channelstats: Prevent possible segfault when faxing

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Under rare circumstances, it's possible for the original audio
session in the active_media_state default_session to be corrupted
instead of removed when switching to the t38/image media session
during fax negotiation.  This can cause a segfault when a "pjsip
show channelstats" attempts to print that audio media session's
rtp statistics.  In these cases, the active_media_state
topology is correctly showing only a single t38/image stream
so we now check that there's an audio stream in the topology
before attempting to use the audio media session to get the rtp
statistics.

Resolves: #592
(cherry picked from commit adcfbcd50e)
This commit is contained in:
George Joseph
2024-02-09 09:15:13 -07:00
committed by Asterisk Development Team
parent f72d97b7b1
commit 3ca2bb5e84
2 changed files with 21 additions and 3 deletions
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4
main/rtp_engine.c
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@@ -2460,6 +2460,10 @@ int ast_rtp_instance_get_stats(struct ast_rtp_instance *instance, struct ast_rtp
{
int res;
if (!instance || !instance->engine || !stats) {
return -1;
}
if (instance->engine->get_stat) {
ao2_lock(instance);
res = instance->engine->get_stat(instance, stats, stat);