From: Sean Bright <sean@seanbright.com>
Date: Fri, 7 Jul 2023 19:57:39 +0000 (-0400)
Subject: chan_iax2.c: Avoid crash with IAX2 switch support.
X-Git-Tag: 21.0.0-pre1~13
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=508657879e8fe01e71b91dca486d607f9b50739e;p=thirdparty%2Fasterisk.git

chan_iax2.c: Avoid crash with IAX2 switch support.

A change made in 82cebaa0 did not properly handle the case when a
channel was not provided, triggering a crash. ast_check_hangup(...)
does not protect against NULL pointers.

Fixes #180
---

diff --git a/channels/chan_iax2.c b/channels/chan_iax2.c
index 5b3caf03b5..3f8e5c1d32 100644
--- a/channels/chan_iax2.c
+++ b/channels/chan_iax2.c
@@ -14323,7 +14323,7 @@ static struct iax2_dpcache *find_cache(struct ast_channel *chan, const char *dat
 			ast_log(LOG_WARNING, "Timeout waiting for %s exten %s\n", data, exten);
 		}
 
-		if (ast_check_hangup(chan)) {
+		if (chan && ast_check_hangup(chan)) {
 			doabort = 1;
 		}