asterisk/third-party/pjproject/patches/0090-sip_transaction-In-tsx_timer_callback-check-if-tsx-i.patch

From beaa7874ff8e3b1d2951218c94e7e6bbba9c0531 Mon Sep 17 00:00:00 2001
From: George Joseph <gjoseph@digium.com>
Date: Sun, 25 Mar 2018 12:30:05 -0600
Subject: [PATCH] sip_transaction: In tsx_timer_callback, check if tsx is
 already gone

There have been cases that when the transaction timer callback is called
the tsx is already destroyed.  This causes a crash.  We now check the
tsx state and return if the tsx is already destroyed.
---
 pjsip/src/pjsip/sip_transaction.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/pjsip/src/pjsip/sip_transaction.c b/pjsip/src/pjsip/sip_transaction.c
index d52b12a72..6d4cdc65f 100644
--- a/pjsip/src/pjsip/sip_transaction.c
+++ b/pjsip/src/pjsip/sip_transaction.c
@@ -1119,6 +1119,10 @@ static void tsx_timer_callback( pj_timer_heap_t *theap, pj_timer_entry *entry)
 
     PJ_UNUSED_ARG(theap);
 
+    if (tsx->state >= PJSIP_TSX_STATE_DESTROYED) {
+        return;
+    }
+
     if (entry->id == TRANSPORT_ERR_TIMER) {
 	/* Posted transport error event */
 	entry->id = 0;
-- 
2.14.3