Fix a crash in res_pjsip_t38 caused by the wrong assumption that a session will alway...

When starting up or shutting down this assumption is false.
........

Merged revisions 400284 from http://svn.asterisk.org/svn/asterisk/branches/12

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@400285 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/res/res_pjsip_t38.c b/res/res_pjsip_t38.c
index 2f36dff..285e901 100644 (file)
--- a/res/res_pjsip_t38.c
+++ b/res/res_pjsip_t38.c
@@ -446,7 +446,8 @@ static void t38_attach_framehook(struct ast_sip_session *session)
                .event_cb = t38_framehook,
        };
 
-       if ((ast_channel_state(session->channel) == AST_STATE_UP) || !session->endpoint->media.t38.enabled) {
+       if (!session->channel || (ast_channel_state(session->channel) == AST_STATE_UP) ||
+           !session->endpoint->media.t38.enabled) {
                return;
        }